4. Typewriting machines
  5. Key-board or key lever-actuating mechanism
  6. Key-board including row of keys having different heights

Oswald Hack

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Assembly for the keyboards of electric typewriters or similar ma

Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent

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Multi-row keyboard for typewriters or similar machines

Typewriting machines – Key-board or key lever-actuating mechanism – Key-board including row of keys having different heights
Patent

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Profile ID: LFUS-PAI-P-1106128

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