US1144870A
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Code-signal device.
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US1141216A
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Electrical recording apparatus.
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US1138991A
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Electrical apparatus and circuit.
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US1128632A
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Lock.
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US1138990A
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Electrical circuit-changing mechanism.
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US1075608A
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Recording system and apparatus.
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US1082774A
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Printing-machine.
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US1055949A
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Electrical recording apparatus.
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US1132884A
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Electrical recording apparatus.
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US1049004A
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Secondary clock.
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US1112571A
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Mechanism for electrically indicating and recording lock-keys.
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US1138989A
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Time-clock mechanism.
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US1075513A
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Electric recording instrument.
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US1138988A
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Visual-signal station.
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US1096136A
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Electric signal and recording system.
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US1121540A
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Electric recording instrument.
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US988218A
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Electrical signal-recording system.
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