4. Typewriting machines
  5. Key-board or key lever-actuating mechanism
  6. Key-board including row of keys having different heights
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Key-holding structure of keyboard with curved operating surface

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

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Keyboard apparatus

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

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Keyboard apparatus

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

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Keyboard having improved keytop

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

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Keyboard having improved keytop

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

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