DE/Sega/Stern switch PCB used in many modular switch assemblies.
Data East/Sega/Stern reference numbers:
500-6138-SW
500-6138-01
500-6138-02
500-6138-04
500-6138-06
500-6138-11
500-6139-02
500-6139-04
500-6139-09
500-6139-11
500-6228-02
500-6228-05
500-6228-06
500-6075-01
500-6075-02
500-6075-03
500-6075-09
500-6075-11
500-6189-02
500-6189-03