800-5520 SD-2 Semaphore Driver Couplers 1 number unknown

1 number unknown

When running on the water

0251 N Scale Unassembled Model Kit

to carry rockets

1/72 Scale Academy US Navy SB2C-4 Helldiver 'Operation Iceberg' Model Kit

800-5520 SD-2 Semaphore Driver Couplers 1 number unknownThe SD 2 Semaphore Driver is designed for use with the CIRCUITRON TORTOISE and an upper or lower quadrant semaphore style signal. NOTE: Neither the TORTOISE, the signal nor the signal linkage are included. The SD 2 provides all the logic circuitry necessary to drive the signal to all three positions, and is designed to work with CIRCUITRON BD 1, BD 2 or BD 3 Block Occupancy Detectors. Other detection circuits that provide a logic low ( or ground)