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

Don C. Liljenquist

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Keyboard

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

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Keyboard assembly and typing method

Typewriting machines – Key-board or key lever-actuating mechanism – Key-board arranged according to character location
Patent

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Profile ID: LFUS-PAI-P-308649

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