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Tactical naval tracer.
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A Motor for Transmitting to a Distance Continuous or Intermittent Angular Movements.
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Electrical device for transmitting to a distance continuous or intermittent angular movements.
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An Improved Electrical Device for Transmitting to a Distance Continuous or Intermittent Angular Movements.
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Electrical Device for Transmitting Angular Movements to a Distance.
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Apparatus for Automatically Recording the Course of Ships.
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Ship's course-recording device.
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