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US5487114A
(en)
|
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Magnetless speaker
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|
US1674683A
(en)
|
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Arrangement for uniform electrical sound transmission
|
|
US1882401A
(en)
|
|
Loud speaker
|
|
CN101970293A
(zh)
|
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电磁转换声桥
|
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BE345140A
(enrdf_load_stackoverflow)
|
|
|
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US2235132A
(en)
|
|
Magnetic telegraphone
|
|
US2862066A
(en)
|
|
Means for recording and reproducing acoustic signals
|
|
US4023162A
(en)
|
|
Electronic buzzer
|
|
US2926313A
(en)
|
|
Electromotive vibrator and oscillator systems
|
|
JP2004363967A
(ja)
|
|
磁歪形スピーカ装置
|
|
US1977939A
(en)
|
|
Electromechanical vibratory system and apparatus
|
|
US5212736A
(en)
|
|
Ribbon speaker
|
|
US1973277A
(en)
|
|
Electroacoustic translating device
|
|
US1632332A
(en)
|
|
Electromagnetic sound reproducer
|
|
US1817612A
(en)
|
|
Sound reproducing system
|
|
US1206643A
(en)
|
|
Controlling alternating currents.
|
|
US1786985A
(en)
|
|
Magnetic pickup
|
|
US1426807A
(en)
|
|
Method of and system for testing transmitters or receivers
|
|
US1682866A
(en)
|
|
Electrical instrument of the telephone type
|
|
US2328836A
(en)
|
|
Loud-speaker and circuit therefor
|
|
GB969515A
(en)
|
|
Improvements in or relating to vibration-producing apparatus
|
|
Watkins
|
|
Circumventing Efficiency and Bass Extension Limitations |
|
Pupin
|
|
Electrical oscillations of low frequency and their resonance |
|
CN108055629A
(zh)
|
|
一种受话器及其装配方法
|
|
US1655403A
(en)
|
|
Sound-reproducing unit
|