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US2864897A
(en)
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Universal phonograph pickup head or the like
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US2852604A
(en)
|
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Sound reproduction apparatus
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BE406882A
(esLanguage)
|
|
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US1827051A
(en)
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Recording and reproducing system and apparatus
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US1952809A
(en)
|
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Sound reproducing apparatus
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US2591070A
(en)
|
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Combined magnetic transducer head and output transformer
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US1728278A
(en)
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Electromagnetic translating device
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US2547464A
(en)
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Sound recording and reproducing apparatus
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Dimmick et al.
|
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Extension of the frequency range of film recording and reproduction |
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US2563882A
(en)
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Magnetic recording system
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US1531252A
(en)
|
|
Electrical reproducer for phonograph records
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CH462251A
(fr)
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Dispositif détecteur à seuil des vibrations d'un haut-parleur
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FR2515468A1
(fr)
|
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Ecouteur dynamique
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US1580954A
(en)
|
|
Electromagnetic sound reproducer
|
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BE358204A
(esLanguage)
|
|
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US2333517A
(en)
|
|
Light valve
|
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US1759967A
(en)
|
|
Electric sound transmitter
|
|
US1557529A
(en)
|
|
Electrical reproducer for phonographs
|
|
Rainey
|
|
Some technical aspects of the Vitaphone |
|
US1771323A
(en)
|
|
Attachment for electric amplifiers
|
|
Clark
|
|
2 The Magnetic Recording |
|
Kellogg
|
|
The three-electrode vacuum tube as applied to the talking motion picture |
|
US1329928A
(en)
|
|
Sound-magnifying phonograph
|
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EP0223652A1
(fr)
|
|
Convertisseur pour lecteur de compact-disques
|
|
Hurst
|
|
High fidelity sound reproduction |