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New Williams ROAD SHOW pinball machine blade opto board.
This board is used on the ROAD SHOW dozer blade assembly
This board has two optical switches that determine the position of the dozer blade in front of Ted's head on the playfield. The motor shaft on the assembly has a plastic disc with one blade which passes through the two optical switches. The game knows when the blade is up or down depending on which switch is interrupted.
Reference:
A-19359