4. Books, strips, and leaves
  5. Book or leaf holder

Robertus A. M. van Ardenne

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Cover for holding together sheets of paper, as well as a bundle

Books – strips – and leaves – Book or leaf holder
Patent

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Keyboaard for a word typewriter

Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent

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Profile ID: LFUS-PAI-P-914383

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