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US1778796A
(en)
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System and apparatus employing the hall effect
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US1882401A
(en)
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Loud speaker
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CN101970293A
(zh)
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电磁转换声桥
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BE345140A
(OSRAM)
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US2862066A
(en)
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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)
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Electronic buzzer
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JP2004363967A
(ja)
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磁歪形スピーカ装置
|
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US1977939A
(en)
|
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Electromechanical vibratory system and apparatus
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US5212736A
(en)
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Ribbon speaker
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US1962154A
(en)
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Magnetostrictive vibrator
|
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US2305626A
(en)
|
|
Electroacoustic apparatus
|
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US1973277A
(en)
|
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Electroacoustic translating device
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GB1094365A
(en)
|
|
Electromechanical oscillators
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US1817612A
(en)
|
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Sound reproducing system
|
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US1786985A
(en)
|
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Magnetic pickup
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US1426807A
(en)
|
|
Method of and system for testing transmitters or receivers
|
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KR20230012574A
(ko)
|
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평판형 라우드스피커 시스템(flat loudspeaker systems)용 전기역학 드라이브
|
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US2328836A
(en)
|
|
Loud-speaker and circuit therefor
|
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Pupin
|
|
Electrical oscillations of low frequency and their resonance |
|
GB969515A
(en)
|
|
Improvements in or relating to vibration-producing apparatus
|
|
Watkins
|
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Circumventing Efficiency and Bass Extension Limitations |
|
US1655403A
(en)
|
|
Sound-reproducing unit
|
|
US1637397A
(en)
|
|
Telephone transmitter and receiver
|
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FR2822631A1
(fr)
|
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Production de son par filtrage de la masse mobile
|