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US2044033A
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Speaking head
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GB373908A
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Improvements in or relating to the driving of band or wire sound records in magnetictalking machines
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GB395683A
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Method and arrangement for uninterrupted repeated reproduction of electromagnetic sound recordings on wire or band shaped sound records
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GB366888A
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Improvements in or relating to the driving of band or wire sound records in magnetic talking machines
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DE566340C
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Drive pulley for the friction drive of the tape-shaped sound carriers of electromagnetic speaking machines
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DE609850C
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Drive device for tape or wire-shaped sound carriers
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DE599633C
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Carbon microphone
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DE565564C
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Arrangement for fixing winding material on winding drums, preferably for speaking machines with a magnetizable sound carrier
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CA349802A
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Telegraphone speaking head
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