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Rice et al.
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Notes on the development of a new type of hornless loud speaker |
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混合扬声器
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Self generating electrical pickup for musical instruments
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Electrical musical instrument
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Loud speaker
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BE365882A
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Concave diaphragm for electro-acoustic transducer
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Sound reproducing device
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rogers |
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Telephone-receiver.
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Loud-speaker
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CN214315570U
(zh)
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一种双功能电磁式耳机
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Improvement in magnet-telephones |
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一种唱出管弦乐声的方法及其实现设备
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(en)
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Electrovibrator
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SU4792A1
(ru)
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Громкоговор щий телефон
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US1792554A
(en)
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Electromagnetic instrument
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KR20250124402A
(ko)
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소리나는 줄넘기
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SU404121A1
(ru)
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Устройство для получения тремоло и вибрато в электромузыкальных инструментах
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SU13856A1
(ru)
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Телефонно-микрофонный усилитель
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JP2001211496A
(ja)
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平面スピーカー
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EXCITED
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Trevor Pinch and Frank Trocco |
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(en)
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Telephone-receiver.
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(en)
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Sound-reproducing device |
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(en)
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Loud speaker
|