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Patent US6370242 - Payphone electronic coin validator - Google Patents
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An Antique Western Electric Model 233G 3-Slot Payphone | eBay

Coin-First Payphone Controller

Coin-First Payphone Controller

A Green Western Electric Model 233G 3-Slot Payphone | eBay

Help Wiring an Old Payphone - DoItYourself.com Community Forums

Patent US6370242 - Payphone electronic coin validator - Google Patents