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

Paul Franklin Steel

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Apparatus for validating items of value, and method of calibrati

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

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Input filtering apparatus for loudspeakers

Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent

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Method and apparatus for validating currency

Check-actuated control mechanisms – Including means to test validity of check
Reexamination Certificate

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Money validation

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

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