4. Pulse or digital communications
  5. Repeaters
  6. Testing

Seijiro Yokoyama

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Code error detecting system in digital code transmission

Telegraphy – Systems – Printing
Patent

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Digital multi-level multi-phase modulation communication system

Pulse or digital communications – Repeaters – Testing
Patent

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Phase synchronizing circuit

Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
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Profile ID: LFUS-PAI-P-99298

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