4. Electricity: measuring and testing
  5. Measuring, testing, or sensing electricity, per se
  6. With rectifier

Bengt Gustav Lofmark

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Apparatus for detecting a voice frequency signal

Patent

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Apparatus for measuring a signal voltage including a current sou

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rectifier
Patent

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Method and arrangement for filtering of signals

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

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Pilot receiver

Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent

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Profile ID: LFUS-PAI-P-297706

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