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Use with the Tortoise Switch Machine and an upper or lower quadrant semaphore-style signal.
Includes al the logic circuitry to drive the signal to all three positions. Works with BD-1 or BD-2 Block Occupancy Detectors. A minimum of two blocks must have detectors installed for the SD-2 to indicate all three positions.
Requires 10-18V DC power. Semaphore signal not included, circuit only.
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