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US1967882A
(en)
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Photo-electric system for recording and reproducing sound
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BE400203A
(Direct)
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US1734675A
(en)
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Method and apparatus for reproducing sound
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US1937021A
(en)
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System for reproducing sound |
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MacKenzie
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Sound recording with the light valve |
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Hardy
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The rendering of tone values in the photographic recording of sound |
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Kellogg
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The ABC of photographic sound recording |
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US1957158A
(en)
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Phonographic invention
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US1913719A
(en)
|
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Apparatus for determining the quantity and quality of light
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US1186717A
(en)
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Voice recording and reproducing device.
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US2033476A
(en)
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Regenerative sound recording device
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US1608261A
(en)
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Ergon |
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US1473976A
(en)
|
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Sound-recording method
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|
Engl
|
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A new process for developing and printing photographic sound records |
|
Anderson
|
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Notes on photographic shutter testing |
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US2184816A
(en)
|
|
Optical apparatus
|
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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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GB348567A
(en)
|
|
Method and devices for recording and reproducing sounds, more particularly applicable to the recording and reproducing of film records
|
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US1925919A
(en)
|
|
Method of and apparatus for producing sound records
|
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US1946587A
(en)
|
|
Recording and reproducing lamp for photographic sound records
|
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Batsel et al.
|
|
The RCA Sound Recording System |
|
US801634A
(en)
|
|
Phonograph.
|
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US1850267A
(en)
|
|
Photoelectric musical instrument
|
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US1807409A
(en)
|
|
Sound recording apparatus
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US1588884A
(en)
|
|
Photographic means for recording sound
|