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US1674683A
(en)
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Arrangement for uniform electrical sound transmission
|
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US1778796A
(en)
|
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System and apparatus employing the hall effect
|
|
US1882401A
(en)
|
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Loud speaker
|
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BE345140A
(2)
|
|
|
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US2235132A
(en)
|
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Magnetic telegraphone
|
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US2862066A
(en)
|
|
Means for recording and reproducing acoustic signals
|
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US2031789A
(en)
|
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Acoustic electric energy converter
|
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US4023162A
(en)
|
|
Electronic buzzer
|
|
US2926313A
(en)
|
|
Electromotive vibrator and oscillator systems
|
|
US1977939A
(en)
|
|
Electromechanical vibratory system and apparatus
|
|
US5212736A
(en)
|
|
Ribbon speaker
|
|
US2305626A
(en)
|
|
Electroacoustic apparatus
|
|
US1973277A
(en)
|
|
Electroacoustic translating device
|
|
KR102953232B1
(ko)
|
|
평판형 라우드스피커 시스템(flat loudspeaker systems)용 전기역학 드라이브
|
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US1817612A
(en)
|
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Sound reproducing system
|
|
US1786985A
(en)
|
|
Magnetic pickup
|
|
US1682866A
(en)
|
|
Electrical instrument of the telephone type
|
|
Pupin
|
|
Electrical oscillations of low frequency and their resonance |
|
GB969515A
(en)
|
|
Improvements in or relating to vibration-producing apparatus
|
|
Watkins
|
|
Circumventing Efficiency and Bass Extension Limitations |
|
US1655403A
(en)
|
|
Sound-reproducing unit
|
|
US1491208A
(en)
|
|
Electrical sound-converting apparatus
|
|
FR2822631A1
(fr)
|
|
Production de son par filtrage de la masse mobile
|
|
JPS584155Y2
(ja)
|
|
電気弦楽器のピックアップ
|
|
US1781376A
(en)
|
|
Electrodynamic sound recorder and reproducer
|