4. Typewriting machines
  5. Key-board or key lever-actuating mechanism
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Data entry system

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

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Data entry system

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

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Data input mechanism

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

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Data input system

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

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Distal chording keyboard

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

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Draining structure for a keyboard

Typewriting machines – Key-board or key lever-actuating mechanism – Key lever or space-bar mounting structure
Reexamination Certificate

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Dual navigation control computer keyboard

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

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Dual navigation control computer keyboard

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

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Dual numerical keyboard based on dominance

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

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