4. Typewriting machines
  5. Key-board or key lever-actuating mechanism
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Ergonomically effective backspacing method

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

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Ergonomically improved standard keyboard

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

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Ergonomically improved standard keyboard

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

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Expandable and compressible keyboard

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

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Expandable and contractible keyboard device

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

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Expandable and contractible keyboard with adjustable key sizes

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

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Expandable keyboard for a portable computer

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

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Expandable keyboard for small computers and the like

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

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Expandable keyboard for small computers and the like

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

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Expandable keyboard including flexible flat cable conductors

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

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