4. Check-actuated control mechanisms
  5. Including means to test validity of check
  6. By testing material composition

Robert C. Lamb, Jr.

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Coin mechanism with a piezoelectric film sensor

Check-actuated control mechanisms – Including means to test validity of check – By testing material composition
Patent

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Coin operated telephone auditor

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

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Coin operated telephone auditor

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

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Profile ID: LFUS-PAI-P-1811015

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