US1674683A
(en )
1928-06-26
Arrangement for uniform electrical sound transmission
US1882401A
(en )
1932-10-11
Loud speaker
BE345140A
(sr )
US2235132A
(en )
1941-03-18
Magnetic telegraphone
US2862066A
(en )
1958-11-25
Means for recording and reproducing acoustic signals
US2926313A
(en )
1960-02-23
Electromotive vibrator and oscillator systems
JP2004363967A
(ja )
2004-12-24
磁歪形スピーカ装置
US1977939A
(en )
1934-10-23
Electromechanical vibratory system and apparatus
US5212736A
(en )
1993-05-18
Ribbon speaker
US2305626A
(en )
1942-12-22
Electroacoustic apparatus
US1973277A
(en )
1934-09-11
Electroacoustic translating device
KR102953232B1
(ko )
2026-04-15
평판형 라우드스피커 시스템(flat loudspeaker systems)용 전기역학 드라이브
US1632332A
(en )
1927-06-14
Electromagnetic sound reproducer
US1817612A
(en )
1931-08-04
Sound reproducing system
US1786985A
(en )
1930-12-30
Magnetic pickup
US1682866A
(en )
1928-09-04
Electrical instrument of the telephone type
Pupin
1893
Electrical oscillations of low frequency and their resonance
GB969515A
(en )
1964-09-09
Improvements in or relating to vibration-producing apparatus
Watkins
2022
Circumventing Efficiency and Bass Extension Limitations
US1655403A
(en )
1928-01-10
Sound-reproducing unit
US1491208A
(en )
1924-04-22
Electrical sound-converting apparatus
FR2822631A1
(fr )
2002-09-27
Production de son par filtrage de la masse mobile
JPS584155Y2
(ja )
1983-01-24
電気弦楽器のピックアップ
US1781376A
(en )
1930-11-11
Electrodynamic sound recorder and reproducer
US1647645A
(en )
1927-11-01
Electrical generator