4. Recording, communication, or information retrieval equipment
  5. Video or audio transmission, recording or playback equipment
  6. Element or attachment

James F. MacKay

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Solid state detector for polarized x-rays

Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent

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Telecommunications unit

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Patent

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Wireless telephone remote control system

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Profile ID: LFUS-PAI-P-1779471

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