JPS6367169B2 - - Google Patents
Info
- Publication number
- JPS6367169B2 JPS6367169B2 JP57179650A JP17965082A JPS6367169B2 JP S6367169 B2 JPS6367169 B2 JP S6367169B2 JP 57179650 A JP57179650 A JP 57179650A JP 17965082 A JP17965082 A JP 17965082A JP S6367169 B2 JPS6367169 B2 JP S6367169B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- cable
- infrared optical
- gas supply
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000013307 optical fiber Substances 0.000 claims description 62
- 239000007789 gas Substances 0.000 description 39
- 230000001681 protective effect Effects 0.000 description 9
- 238000001035 drying Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 150000004820 halides Chemical class 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- LYQFWZFBNBDLEO-UHFFFAOYSA-M caesium bromide Chemical compound [Br-].[Cs+] LYQFWZFBNBDLEO-UHFFFAOYSA-M 0.000 description 4
- AIYUHDOJVYHVIT-UHFFFAOYSA-M caesium chloride Chemical compound [Cl-].[Cs+] AIYUHDOJVYHVIT-UHFFFAOYSA-M 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910016036 BaF 2 Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- XQPRBTXUXXVTKB-UHFFFAOYSA-M caesium iodide Inorganic materials [I-].[Cs+] XQPRBTXUXXVTKB-UHFFFAOYSA-M 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- GBECUEIQVRDUKB-UHFFFAOYSA-M thallium monochloride Chemical compound [Tl]Cl GBECUEIQVRDUKB-UHFFFAOYSA-M 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000005383 fluoride glass Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/102—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type for infrared and ultraviolet radiation
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Insulated Conductors (AREA)
Description
【発明の詳細な説明】
この発明は赤外用光フアイバケーブルの構造に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an infrared optical fiber cable.
赤外用光フアイバは、波長２〜10μmの赤外光
を透過させることにより、エネルギーや情報を伝
送するフアイバである。この赤外用光フアイバ
は、ハロゲン化物、フツ化物ガラス、カルコゲナ
イトなどの材料から形成されるが、これら材料の
うち、CsI，CsBr，CsCl，TlI，TlBr，TlCl，
NaCl，BaF2等のハロゲン化物は、程度の差はあ
るがいずれも水溶性であるため、これらハロゲン
化物よりなる赤外用光フアイバを１本以上収容し
てなる赤外用光フアイバコードもしくは赤外用光
フアイバケーブルは、空気中の水分による光フア
イバ表面の溶解を防止するため、その端部は特別
の固定部材を用いて密閉構造となつている。 An infrared optical fiber is a fiber that transmits energy and information by transmitting infrared light with a wavelength of 2 to 10 μm. This infrared optical fiber is made of materials such as halides, fluoride glasses, and chalcogenite. Among these materials, CsI, CsBr, CsCl, TlI, TlBr, TlCl,
Halides such as NaCl and BaF 2 are all water-soluble to varying degrees, so infrared optical fiber cords or infrared optical fibers containing one or more infrared optical fibers made of these halides are used. In order to prevent the surface of the optical fiber from dissolving due to moisture in the air, the end of the fiber cable is sealed using a special fixing member.
しかし、上記コードやケーブルは、接続作業時
の端末の加工や布設等に際してはどうしても端部
が外気に暴露され、その間に光フアイバが空気中
の水分に浸蝕され、伝送損失が増加したり、CO2
レーザなどの高エネルギー光を入射したときに光
フアイバが浸蝕部分で破壊する恐れが生じたりす
ることがあつた。 However, the ends of the above-mentioned cords and cables are inevitably exposed to the outside air during terminal processing and installation during connection work, and during this time the optical fibers are eroded by moisture in the air, increasing transmission loss and CO2. 2
When high-energy light such as a laser is applied, there is a risk that the optical fiber may be destroyed at the corroded portion.
また、赤外用光フアイバケーブルをレーザメス
などに用いる場合には、光フアイバ内でレーザ光
が一部熱に変化し、光フアイバが加熱されること
になり、よつて上記ケーブルを効率よく冷却する
必要がある。 In addition, when using an infrared optical fiber cable for a laser scalpel, etc., part of the laser light changes into heat within the optical fiber, heating the optical fiber, so it is necessary to efficiently cool the cable. There is.
この発明は上記事情に鑑みてなされたもので、
赤外用光フアイバコードまたはケーブルの布設や
端末加工の際においても光フアイバの端部が外気
に直接触れることを防止し、よつて光フアイバの
水分による浸蝕を防止できるとともに光フアイバ
を効率よく冷却できる赤外用光フアイバケーブル
を提供することを目的とし、ケーブルの外周に長
手方向に沿つて多数のガス供給栓を設けたことを
特徴とするものである。 This invention was made in view of the above circumstances,
Prevents the end of the optical fiber from coming into direct contact with the outside air during installation or terminal processing of infrared optical fiber cords or cables, thereby preventing corrosion of the optical fiber due to moisture and cooling the optical fiber efficiently. The purpose of this invention is to provide an infrared optical fiber cable, which is characterized in that a large number of gas supply plugs are provided along the length of the outer periphery of the cable.
以下、図面を参照してこの発明を詳しく説明す
る。 Hereinafter, the present invention will be explained in detail with reference to the drawings.
第１図および第２図はこの発明の赤外用光フア
イバケーブルの一例を示すもので、光フアイバが
１本の光フアイバコードの例である。図中符号１
は赤外用光フアイバである。この赤外用光フアイ
バ１はCsI，CsBr，CsCl，TlI，TlBr，TlCl，
NaCl，BaF2等の水溶性でかつ比較的高屈折率の
ハロゲン化物で形成されている。そして、この光
フアイバ１は、ポリテトラフルオロエチレン、テ
トラフルオロエチレン―ヘキサフルオロプロピレ
ン共重合体などのフツ素樹脂で形成された保護ス
リーブ２内にルーズに中空部３を介して収容され
て赤外用光フアイバコード４とされている。この
場合、光フアイバ１はコア、中空部３がクラツド
として機能する。そして、上記保護スリーブ２の
外周には、その長手方向に沿つて一定の間隔を置
いて多数のガス供給栓５，５……が突設されてい
る。 FIGS. 1 and 2 show an example of an infrared optical fiber cable of the present invention, and are an example of an optical fiber cord having one optical fiber. Code 1 in the diagram
is an infrared optical fiber. This infrared optical fiber 1 includes CsI, CsBr, CsCl, TlI, TlBr, TlCl,
It is made of a water-soluble halide with a relatively high refractive index, such as NaCl or BaF 2 . The optical fiber 1 is loosely housed through a hollow part 3 in a protective sleeve 2 made of a fluororesin such as polytetrafluoroethylene or tetrafluoroethylene-hexafluoropropylene copolymer. It is called optical fiber code 4. In this case, the optical fiber 1 functions as a core, and the hollow portion 3 functions as a cladding. A large number of gas supply plugs 5, 5, . . . are provided protruding from the outer periphery of the protective sleeve 2 at regular intervals along its longitudinal direction.
このガス供給栓５は、合成樹脂、好ましくは保
護スリーブ２を形成するフツ素樹脂で形成され、
一端が封止された中空円筒体を保護スリーブ２に
一体に固設して形成したもので、中空円筒体内部
の中空室６は、光フアイバ１と保護スリーブ２と
で構成される中空部３に連通されている。そし
て、中空部３には乾燥空気などの乾燥ガスが充填
されている。 The gas supply valve 5 is made of a synthetic resin, preferably a fluororesin forming the protective sleeve 2,
It is formed by integrally fixing a hollow cylindrical body with one end sealed to a protective sleeve 2, and a hollow chamber 6 inside the hollow cylindrical body is a hollow part 3 made up of an optical fiber 1 and a protective sleeve 2. is communicated with. The hollow portion 3 is filled with dry gas such as dry air.
このような構造の赤外用光フアイバコード４は
端末加工や布設作業などの光フアイバ１が外気に
接触する可能性がある場合、第３図に示すように
外気に接触する光フアイバコード４の端部近くに
あるガス供給栓５を開放し、（これは中空円筒体
の中間部をハサミなどで切断することにより行わ
れる。）これにガス供給管７を接続し、図示しな
い乾燥ガス供給装置からの乾燥ガスをガス供給栓
５を経てコード４内の中空部３に供給する。供給
された乾燥ガスは光フアイバコード４の端部から
外部に吹き出し、吹き出した乾燥ガスは、光フア
イバ１を包み込む形となるので、端末加工など最
中連続して乾燥ガスを供給すれば、端末加工等の
際に光フアイバ１が直接外気に接触することがな
くなり、したがつて外気中の水分による浸蝕を受
けることがない。光フアイバコード４の端末加工
等が終つて、光フアイバ１が直接外気に触れる恐
れがなくなれば、中空円筒体の中間部を乾燥ガス
を供給しながらトーチバーナなどで加熱して封止
してガス供給栓５を閉じ、乾燥ガスの供給を停止
し、ガス供給栓５からガス供給管７を取り外す。
かくして、赤外用光フアイバコード４は、その光
フアイバ１が外気に全く接触することなく、端末
加工や布設作業を受けることが可能となり、これ
ら作業に伴う光フアイバ１の損傷を完全に防止で
きる。そして、ガス供給栓５は保護スリーブ２上
に一定間隔で多数突設されているので、光フアイ
バコード４を任意の位置で切断しても、光フアイ
バ１の保護を十分行うことができる。 The infrared optical fiber cord 4 having such a structure is used when the optical fiber 1 may come into contact with the outside air during terminal processing or installation work, as shown in FIG. (This is done by cutting the middle part of the hollow cylindrical body with scissors or the like.) A gas supply pipe 7 is connected to this, and a dry gas supply device (not shown) is connected to the gas supply valve 5. The drying gas is supplied to the hollow part 3 in the cord 4 through the gas supply valve 5. The supplied drying gas is blown out from the end of the optical fiber cord 4, and the blown out drying gas wraps around the optical fiber 1. Therefore, if drying gas is continuously supplied during terminal processing, the terminal The optical fiber 1 does not come into direct contact with the outside air during processing, and therefore does not suffer from corrosion due to moisture in the outside air. Once the end processing of the optical fiber cord 4 is finished and there is no danger that the optical fiber 1 will come into direct contact with the outside air, the middle part of the hollow cylindrical body is sealed by heating with a torch burner while supplying dry gas, and the gas is supplied. The stopcock 5 is closed, the supply of drying gas is stopped, and the gas supply pipe 7 is removed from the gas supply stopper 5.
In this way, the infrared optical fiber cord 4 can be subjected to terminal processing and installation work without the optical fiber 1 coming into contact with the outside air at all, and damage to the optical fiber 1 caused by these works can be completely prevented. Since a large number of gas supply plugs 5 are protruded from the protective sleeve 2 at regular intervals, the optical fiber 1 can be sufficiently protected even if the optical fiber cord 4 is cut at an arbitrary position.
第４図は、この発明の赤外用光フアイバケーブ
ルの他の例を示すもので、この例では赤外用光フ
アイバ心線を複数本収容した光フアイバケーブル
について説明する。なお、第１図および第２図に
示したものと同一構成部分には同一符号を付して
その説明を省略する。 FIG. 4 shows another example of the infrared optical fiber cable of the present invention, and in this example, an optical fiber cable containing a plurality of infrared optical fiber cores will be described. Components that are the same as those shown in FIGS. 1 and 2 are designated by the same reference numerals and their explanations will be omitted.
図中符号８は亜鉛メツキ鋼線を複数本撚り合せ
て形成したテンシヨンメンバである。このテンシ
ヨンメンバ８を中心に、赤外用光フアイバ１およ
びこの赤外用光フアイバ１をルーズに収容する保
護スリーブ２とからなる赤外用光フアイバ心線９
が６本撚り合され、さらにその外側にラツプシー
ス，メタルコルゲートシース等のシース１０が設
けられてこの例の赤外用光フアイバケーブル１１
が形成されている。そして、シース１０の外周に
はケーブル１１の長手方向にそつて一定間隔を置
いてガス供給栓１２，１２……が設けられてい
る。この例のガス供給栓１２は、第５図に示すよ
うに、シース１０の所定位置に穿設された孔１３
に粘着性に富むゴム組成物よりなる円盤状のブツ
シユ１４を埋設してなるものである。上記ブツシ
ユ１４はその端面にシース１０の端部を喰え込む
凹状の嵌合溝１４ａが設けられており、この嵌合
溝１４ａとブツシユ１４自体の粘着性によつてシ
ース１０に固定されている。 Reference numeral 8 in the figure is a tension member formed by twisting a plurality of galvanized steel wires. An infrared optical fiber core 9 consisting of an infrared optical fiber 1 and a protective sleeve 2 that loosely accommodates the infrared optical fiber 1 is centered around this tension member 8.
are twisted together, and a sheath 10 such as a lap sheath or a metal corrugated sheath is provided on the outside of the infrared optical fiber cable 11.
is formed. Gas supply plugs 12, 12, . . . are provided on the outer periphery of the sheath 10 at regular intervals along the longitudinal direction of the cable 11. As shown in FIG.
A disc-shaped bushing 14 made of a highly adhesive rubber composition is embedded in the rubber composition. The bush 14 is provided with a concave fitting groove 14a on its end face into which the end of the sheath 10 fits, and is fixed to the sheath 10 by the fitting groove 14a and the adhesiveness of the bush 14 itself.
そして先の例のように、この光ケーブル１１の
端部が外気に晒される恐れがある場合には、第６
図に示すように乾燥ガス供給装置（図示せず）に
接続されたガス注入筒１５の注入針１５ａをブツ
シユ１４に注し込み、これから乾燥ガスをシース
１０内に供給する。これによつて、ケーブル１１
の端部は乾燥ガスに包まれ、外気に直接触れるこ
とがなく、光フアイバ１……の損傷が防止でき
る。 As in the previous example, if the end of this optical cable 11 is likely to be exposed to the outside air, the sixth
As shown in the figure, an injection needle 15a of a gas injection tube 15 connected to a drying gas supply device (not shown) is injected into the bush 14, and drying gas is supplied into the sheath 10 from there. With this, cable 11
The end of the optical fiber 1 is surrounded by dry gas and does not come into direct contact with the outside air, thereby preventing damage to the optical fiber 1.
ガス供給の必要がなくなれば、ガス注入筒１５
をブツシユ１４から引き抜けば、ブツシユ１４自
体の粘着性によつて、注入針１５ａによる穴は塞
がれ、外気の侵入，乾燥ガスの漏出は起らない。 If there is no need for gas supply, the gas injection tube 15
When the injection needle 15a is pulled out from the bush 14, the hole made by the injection needle 15a is closed due to the adhesiveness of the bush 14 itself, and no intrusion of outside air or leakage of dry gas occurs.
以下、実施例を示して具体的に説明する。 Hereinafter, a specific explanation will be given by showing examples.
第１図に示した構造の赤外用光フアイバコード
４を製造した、光フアイバ１は外径１mmで、
CaBr系材料より作られた。保護スリーブ２はテ
トラフルオロエチレン―ヘキサフルオロプロピレ
ン共重合体（FEP）よりなり、内径２mm，外径
３mmである。そして、ガス供給栓５はコード４の
長手方向にそつて50cm毎に設けられ、突出長さ15
mm，外径３mm，内径２mmで同様にFEPで形成さ
れている。この赤外用光フアイバコード４は長さ
100m単位で巻かれている。そして、このコード
４を任意の長さに切り取り、端末加工を施す際、
切断面から最も近いガス供給栓５から乾燥空気を
50／分の割合で送給して作業を行つたところ、
光フアイバ１の水分による侵蝕は全くなく、伝送
損失の増加も認められなかつた。
The infrared optical fiber cord 4 having the structure shown in FIG. 1 was manufactured, and the optical fiber 1 had an outer diameter of 1 mm.
Made from CaBr-based materials. The protective sleeve 2 is made of tetrafluoroethylene-hexafluoropropylene copolymer (FEP) and has an inner diameter of 2 mm and an outer diameter of 3 mm. The gas supply valves 5 are provided every 50 cm along the longitudinal direction of the cord 4, and have a protruding length of 15 cm.
mm, outer diameter 3mm, inner diameter 2mm, and is similarly made of FEP. This infrared optical fiber cord 4 has a length of
It is wound in 100m units. Then, when cutting this cord 4 to any length and processing the terminal,
Supply dry air from the gas supply valve 5 closest to the cutting surface.
When the work was carried out by feeding at a rate of 50/min,
There was no corrosion of the optical fiber 1 due to moisture, and no increase in transmission loss was observed.
以上説明したように、この発明の赤外用光フア
イバケーブルは、ケーブルにその長手方向に沿つ
て一定間隔にガス供給栓を設け、外部からケーブ
ル内にガスを導入しうるようにしたものであるの
で、このケーブルを構成する赤外用光フアイバが
水溶性のハロゲン化物で形成されている場合、端
末加工、布設などのケーブル端部が外気に晒らさ
れる恐れがあり、光フアイバが外気中の水分で浸
蝕される可能性がある場合に、ガス供給栓より乾
燥ガスを供給して端部を乾燥ガスで包み込むこと
ができ、上記水分による浸蝕を防止しつつ作業を
進めることができる。また、このケーブルをレー
ザメスなどの導波路として用いる際に、ガス供給
栓から低温ガス（ヘリウム，水素など）を供給
し、光フアイバの冷却を行うこともできる。 As explained above, in the infrared optical fiber cable of the present invention, gas supply plugs are provided at regular intervals along the length of the cable so that gas can be introduced into the cable from the outside. If the infrared optical fiber that makes up this cable is made of a water-soluble halide, there is a risk that the end of the cable may be exposed to the outside air during terminal processing or installation, and the optical fiber may be exposed to moisture in the outside air. If there is a possibility of corrosion due to moisture, dry gas can be supplied from the gas supply valve to envelop the end with dry gas, allowing work to proceed while preventing corrosion due to the moisture. Furthermore, when using this cable as a waveguide for a laser scalpel or the like, the optical fiber can be cooled by supplying low-temperature gas (helium, hydrogen, etc.) from a gas supply valve.
第１図はこの発明の赤外用光フアイバケーブル
の一例を示す一部断面視した斜視図、第２図は同
じく断面図、第３図はガス供給状態を示す断面
図、第４図はこの発明のケーブルの他の例を示す
一部断面視した斜視図、第５図は第４図の要部拡
大断面図、第６図はガス供給状態を示す断面図で
ある。
１…赤外用光フアイバ、２…保護スリーブ、４
…赤外用光フアイバコード、５…ガス供給栓、１
０…シース、１１…赤外用光フアイバケーブル、
１２…ガス供給栓。
Fig. 1 is a partially sectional perspective view showing an example of an infrared optical fiber cable of the present invention, Fig. 2 is a sectional view of the same, Fig. 3 is a sectional view showing a gas supply state, and Fig. 4 is a sectional view of the invention. FIG. 5 is an enlarged sectional view of the main part of FIG. 4, and FIG. 6 is a sectional view showing a gas supply state. 1... Infrared optical fiber, 2... Protective sleeve, 4
...Infrared optical fiber cord, 5...Gas supply valve, 1
0...Sheath, 11...Infrared optical fiber cable,
12...Gas supply valve.
Claims (1)
赤外用光フアイバケーブルにおいて、このケーブ
ルの外周にその長手方向に一定間隔でガス供給栓
を設け、外部からこのケーブル内にガスを導入可
能としたことを特徴とする赤外用光フアイバケー
ブル。1. In an infrared optical fiber cable that accommodates one or more infrared optical fibers, gas supply plugs are provided on the outer periphery of the cable at regular intervals in the longitudinal direction so that gas can be introduced into the cable from the outside. An infrared optical fiber cable characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57179650A JPS5968707A (en) | 1982-10-13 | 1982-10-13 | Optical fiber cable for infrared rays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57179650A JPS5968707A (en) | 1982-10-13 | 1982-10-13 | Optical fiber cable for infrared rays |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5968707A JPS5968707A (en) | 1984-04-18 |
| JPS6367169B2 true JPS6367169B2 (en) | 1988-12-23 |
Family
ID=16069476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57179650A Granted JPS5968707A (en) | 1982-10-13 | 1982-10-13 | Optical fiber cable for infrared rays |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5968707A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH041530Y2 (en) * | 1986-02-10 | 1992-01-20 | ||
| NL1002363C2 (en) * | 1995-03-24 | 1996-09-26 | Nederland Ptt | Removing moisture from hollow conductors such as cable ducts. |
| GB2432709A (en) * | 2005-11-29 | 2007-05-30 | Andrew Dignan | Preventing ingress of moisture into a transmission line cable |
| CN104608357B (en) * | 2014-12-30 | 2017-04-12 | 长飞光纤光缆股份有限公司 | Mold for inflating, filling and forming of full-dry optical-cable loose tube |
-
1982
- 1982-10-13 JP JP57179650A patent/JPS5968707A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5968707A (en) | 1984-04-18 |
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