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BE345991A
(forum.php)
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BE392448A
(forum.php)
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US2036554A
(en)
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Sound record and method of producing same
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BE423894A
(forum.php)
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CH204555A
(fr)
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Procédé pour effectuer des enregistrements de sons.
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BE422383A
(forum.php)
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BE357588A
(forum.php)
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BE356171A
(forum.php)
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BE369842A
(forum.php)
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BE361230A
(forum.php)
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BE375271A
(forum.php)
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BE343938A
(forum.php)
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BE371364A
(forum.php)
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US1647353A
(en)
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Photo-electric means for reproducing sound from graphical records
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CH329797A
(fr)
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Procédé d'enregistrement de pistes sonores circulaires et dispositif pour la mise en oeuvre de ce procédé
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BE364512A
(forum.php)
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CH122107A
(fr)
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Procédé et appareil optique pour la reproduction des ondes acoustiques enregistrées photographiquement sur un film.
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BE490849A
(forum.php)
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BE471381A
(forum.php)
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US1946589A
(en)
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Method and apparatus for recording and reproducing photographic sound records
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BE399600A
(forum.php)
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BE480257A
(forum.php)
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BE363715A
(forum.php)
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BE351727A
(forum.php)
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BE346930A
(forum.php)
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