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Delayed circuit closers
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Apparatus for the programmed transmission of coded signals over selected wires
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Delayed circuit closers
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Systems permitting response by only selected units of those connected to a single channel
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Replacement of a plurality of channels by a single channel
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Stepping switch apparatus
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Delayed circuit closer
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Traffic signaling system and apparatus
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Alternating current synchronous induction disk motor with means for eliminating backlash and overrun of gear trains associated with electric motors
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Timing mechanism
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Timing mechanism
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Timing mechanism
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Timer
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Timing switches and mechanism
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Timing switch and mechanism
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Variable timer
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