US1290658A
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Circuit-controlling apparatus.
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US1272317A
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Circuit-controller.
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US1243221A
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Circuit-controller.
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US1152843A
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Circuit-controller.
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US1201869A
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Circuit-controller.
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US1152842A
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Variable-resistance device.
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US1236356A
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Electrically-operated piano-player.
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US1165904A
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Electromagnet.
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US1267454A
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Circuit-controller.
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US1209646A
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Electromagnet.
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US1165903A
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Playing apparatus for musical instruments.
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US1211623A
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Electrically-operated piano-player.
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US1112658A
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Circuit-controlling finger for electrically-operated music-playing apparatus.
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US1152841A
|
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Electrically-operated piano-player.
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US1112657A
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Circuit-controlling finger for electrically-operated musical instruments.
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US1165902A
|
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Pawl-and-ratchet mechanism.
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US1116327A
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Playing apparatus for musical instruments.
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US1058902A
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Playing apparatus for musical instruments.
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