4. Typewriting machines
  5. Key-board or key lever-actuating mechanism
  6. Key-board arranged according to character location

Robert Granadino

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Ergonomic keyboard

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

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Ergonomic keyboard

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

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Ergonomic keyboard

Typewriting machines – Key-board or key lever-actuating mechanism – Key-board including keys grouped to facilitate positioning...
Reexamination Certificate

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Ergonomic keyboard

Typewriting machines – Key-board or key lever-actuating mechanism – Key-board including keys grouped to facilitate positioning...
Reexamination Certificate

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Ergonomic keyboard including arcuate elongated keys

Typewriting machines – Key-board or key lever-actuating mechanism – Key-board including keys grouped to facilitate positioning...
Patent

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Profile ID: LFUS-PAI-P-1390161

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