Darrell D. Cole

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Electronic telephone ringer including anti-bell tap provisions

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Method and apparatus for automatically identifying an individual

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Method and apparatus for detecting direct currents in a transmis

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
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Telephone line lifting apparatus

Deposit and collection receptacles – Fare boxes – Multiple coin slot and runway
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Profile ID: LFUS-PAI-P-478571

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