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

Frederick A. Rosebrock

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Coupling apparatus for telephone handsets

Telephonic communications – Including aid for handicapped user
Patent

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Directional microphone assembly

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent

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Wall-mounted, coinless public telephone

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

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Profile ID: LFUS-PAI-P-553490

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