4. Communications: electrical
  5. Audible indication
  6. Percussion-type sound producer

Steven B. Hirsch

Inventor

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Keyboard

Typewriting machines – Key-board or key lever-actuating mechanism – Key-board having multiple-character – multiple-movement keys
Reexamination Certificate

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Secure input system

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Secure keyboard input terminal

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Unitary key panel

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Profile ID: LFUS-PAI-P-1565262

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