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CA2219152A1
(fr)
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Combine telephonique
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BE331779A
(https=)
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US1732029A
(en)
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Acoustic instrument
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FR2570238A1
(fr)
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Vibrateur electromecanique audio-frequence, destine a la reproduction de vibrations ressenties par le corps humain
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GB2440885A
(en)
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Giant magnetostrictive speaker
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US2031789A
(en)
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Acoustic electric energy converter
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US4223224A
(en)
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Charged-particle beam optical apparatus including a damped supplemental oscillator for the specimen holder thereof
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DE3023155A1
(de)
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Kontaktmikrofon zur aufnahme der menschlichen sprache
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US4215249A
(en)
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Method and device for controlling wrinkles in a vibratile diaphragm
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SU1275791A1
(ru)
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Динамический громкоговоритель
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EP0117195A1
(fr)
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Electrovalves à commande piézoélectrique
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US2047387A
(en)
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Holder for piezoelectric crystals
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BE623865A
(https=)
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US1695126A
(en)
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Loud speaker
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FR2866777A3
(fr)
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Haut-parleur mince
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BE696758A
(https=)
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BE423598A
(https=)
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BE347313A
(https=)
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BE421837A
(https=)
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BE435546A
(https=)
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CH266141A
(fr)
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Pick-up.
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BE395063A
(https=)
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BE377276A
(https=)
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BE331724A
(https=)
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BE538824A
(https=)
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