4. Communications: electrical
  5. Selective
  6. Having indication or alarm

Sherman W. Duck

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Level monitoring methods and apparatus particularly for high-res

Communications: electrical – Selective – Having indication or alarm
Patent

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Photoconductive commutators

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Thermo-magnetic image recording methods and apparatus

Recorders – Magnetographic
Patent

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Profile ID: LFUS-PAI-P-606891

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