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Patent US6370242 - Payphone electronic coin validator - Google Patents
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Help Wiring an Old Payphone - DoItYourself.com Community Forums
Coin-First Payphone Controller
Patent US6370242 - Payphone electronic coin validator - Google Patents
An Antique Western Electric Model 233G 3-Slot Payphone | eBay
Coin-First Payphone Controller
A Green Western Electric Model 233G 3-Slot Payphone | eBay