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US5487114A
(en)
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Magnetless speaker
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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
(enExample)
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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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US2926313A
(en)
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Electromotive vibrator and oscillator systems
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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)
|
|
Electromechanical vibratory system and apparatus
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US5212736A
(en)
|
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Ribbon speaker
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US1973277A
(en)
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|
Electroacoustic translating device
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US1632332A
(en)
|
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Electromagnetic sound reproducer
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GB1094365A
(en)
|
|
Electromechanical oscillators
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US1817612A
(en)
|
|
Sound reproducing system
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US1206643A
(en)
|
|
Controlling alternating currents.
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US1786985A
(en)
|
|
Magnetic pickup
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US1426807A
(en)
|
|
Method of and system for testing transmitters or receivers
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US1682866A
(en)
|
|
Electrical instrument of the telephone type
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GB969515A
(en)
|
|
Improvements in or relating to vibration-producing apparatus
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|
Pupin
|
|
Electrical oscillations of low frequency and their resonance |
|
Watkins
|
|
Circumventing Efficiency and Bass Extension Limitations |
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US1655403A
(en)
|
|
Sound-reproducing unit
|
|
US1491208A
(en)
|
|
Electrical sound-converting apparatus
|
|
FR2822631A1
(fr)
|
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Production de son par filtrage de la masse mobile
|
|
JPS584155Y2
(ja)
|
|
電気弦楽器のピックアップ
|