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Pinball Life: Trough Opto Transmitter / Receiver Board Set (4 Ball) For Williams/Bally Pinball Machines
Williams/Bally LED Transmiter ( Emitter ) For Optic Assemblies [PIN-a-16908-TRANS-OPTIC] - $0.65 : TwistedQuarter.com, Arcade Parts Specialist
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Opto Ramp Switch Board for Bally/Williams (A-13901) | Creature from the Black Lagoon | Pinball Parts by Game | Shop | Pinballcenter
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