4. Typewriting machines
  5. Key-board or key lever-actuating mechanism
  6. Key-cap or key-stem structure
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Bio-mechanical neuro-sensory keyboard structure and operating me

Typewriting machines – Key-board or key lever-actuating mechanism – Key-cap or key-stem structure
Patent

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Button apparatus with a complex elastic unit

Typewriting machines – Key-board or key lever-actuating mechanism – Key-cap or key-stem structure
Reexamination Certificate

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