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US2069242A
(en)
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Electroacoustic energy converting system
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BE331779A
(2)
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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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BE439377A
(2)
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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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US1733013A
(en)
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Sound-reproducing device
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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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BE335007A
(2)
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US1695126A
(en)
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Loud speaker
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BE696758A
(2)
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BE423598A
(2)
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BE343788A
(2)
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US1797197A
(en)
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Electromagnetic pick up
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US2106224A
(en)
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Device for transforming acoustical energy into electrical energy
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CH647371A5
(en)
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Electroacoustic enclosure intended to produce sounds by means of several loudspeakers
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BE347313A
(2)
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BE435546A
(2)
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CH266141A
(fr)
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Pick-up.
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BE395063A
(2)
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BE377276A
(2)
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BE538824A
(2)
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JP2006041575A
(ja)
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エレクトレットコンデンサマイクロホンの製造方法
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