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Telephone amplifier with switchable gain control

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Telephone handset amplifier circuit

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Telephone handset interface device

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Telephone handset microphone level adjustment

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Telephone handset with user-adjustable amplitude, default...

Telephonic communications – Substation or terminal circuitry – Amplifying
Reexamination Certificate

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Telephone headset amplifier with battery saver, receive line noi

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Telephone headset amplifier with battery saver, receive line noi

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Telephone headset interface circuit

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Telephone line monitor amplifier

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Telephone power supply

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Time dependant, variable amplitude threshold output circuit for

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Time dependent, variable amplitude threshold output circuit for

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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Transmit by-pass cable

Telephonic communications – Substation or terminal circuitry – Amplifying
Patent

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