4. Telephonic communications
  5. Substation or terminal circuitry
  6. Sidetone control or hybrid circuit

Yoshihiro Kurokawa

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High-frequency noise elimination for use in telephone systems

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Method for treating for-treatment water containing organic...

Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate

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Profile ID: LFUS-PAI-P-656898

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