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

Protel, Inc.

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Apparatus and method for automated audio teleconferencing having

Telephonic communications – Special services – Conferencing
Patent

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Apparatus and method for automated audio teleconferencing having

Telephonic communications – Audio message storage – retrieval – or synthesis – Message management
Patent

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Apparatus and method for automated audio teleconferencing having

Telephonic communications – Special services – Conferencing
Patent

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Billing system

Telephonic communications – With usage measurement – Call charge metering or monitoring
Patent

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Billing system

Telephonic communications – With usage measurement – Call charge metering or monitoring
Reexamination Certificate

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