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(en )
1985-10-29
Sound reproducing system utilizing motional feedback and an improved integrated magnetic structure
US1568589A
(en )
1926-01-05
Loud speaker
US1827051A
(en )
1931-10-13
Recording and reproducing system and apparatus
GB227391A
(en )
1925-01-05
Improvements in or relating to electric apparatus for the reproduction of recorded sounds
BE358204A
(sr )
JP2000078689A
(ja )
2000-03-14
電気・音響変換装置
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(en )
1981-04-21
Moving coil pick-up assembly for use in a record player
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(ko )
2003-10-17
주파수 특성 조정부재가 구비된 스피커
US1915804A
(en )
1933-06-27
Electrodynamic pickup
US1728278A
(en )
1929-09-17
Electromagnetic translating device
US2110092A
(en )
1938-03-01
Commercial phonograph
US2213936A
(en )
1940-09-03
Electrodynamic pickup
US1531252A
(en )
1925-03-24
Electrical reproducer for phonograph records
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(en )
1930-05-27
Electric sound transmitter
JP2000069587A
(ja )
2000-03-03
スピーカ
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(en )
1925-10-13
Electrical reproducer for phonographs
US3219764A
(en )
1965-11-23
Stylus assembly for a phonograph pickup cartridge
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(en )
1945-09-04
Phonograph pickup
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(en )
1936-04-28
Acoustic translating device
JPS6116696A
(ja )
1986-01-24
スピ−カ装置
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(en )
1926-10-26
Phonographic apparatus and method therefor
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(en )
1931-07-07
Electrically operating sound recorder and reproducer
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(en )
1927-04-26
Apparatus for sound reproductions
US1724099A
(en )
1929-08-13
Apparatus for sound reproduction
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(en )
1929-12-31
of east orange