4. Telephonic communications
  5. Supervisory or control line signaling
  6. Using line or loop condition detection

Mitsuo Tsuda

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Line in-use indicator for a telephone set and facsimile machine

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Liquid treating process and apparatus, as well as liquid...

Liquid purification or separation – Processes – Using magnetic force
Reexamination Certificate

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Profile ID: LFUS-PAI-P-999088

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