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US1653836A
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System for producing records of sounds on sensitized traveling film bands
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GB226218A
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Improvements in and connected with apparatus for graphically recording sound waves
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US1582374A
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System for recording acoustic and other oscillations
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GB207178A
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Improvements in and connected with means for recording vibrations
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GB207179A
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Improvements in and connected with means for indicating vibrations
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GB196939A
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Improved apparatus for reproducing sounds photographically recorded on a film
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