4. Telephonic communications
  5. With check operated control
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Line card with distributed signaling voltages

Telephonic communications – With check operated control – Coin signalling or control
Patent

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Line powered pay telephone with power management

Telephonic communications – With check operated control – Coin signalling or control
Patent

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Line-powered pay telephone

Telephonic communications – With check operated control
Reexamination Certificate

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Low voltage operated coin relay

Telephonic communications – With check operated control – Coin signalling or control
Patent

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Lower casing structure of payphone

Telephonic communications – With check operated control
Patent

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