4. Telegraphy
  5. Systems
  6. Printing

Paul Anthony Spencer

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Electrical filters

Telegraphy – Systems – Printing
Patent

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Metal detectors for discriminatory detection of buried metal obj

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
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Signal compressors and expanders

Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
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Profile ID: LFUS-PAI-P-962506

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