4. Typewriting machines
  5. For line-spacing by incremental rotation of platen
  6. By pawl and ratchet wheel drive
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Force transferring magnetic actuator apparatus and method

Typewriting machines – For line-spacing by incremental rotation of platen – By pawl and ratchet wheel drive
Patent

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Line spacing device for an office machine

Typewriting machines – For line-spacing by incremental rotation of platen – By pawl and ratchet wheel drive
Patent

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Line spacing mechanism for typewriters or like machines

Typewriting machines – For line-spacing by incremental rotation of platen – By pawl and ratchet wheel drive
Patent

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Platen drive device

Typewriting machines – For line-spacing by incremental rotation of platen – By pawl and ratchet wheel drive
Patent

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Signal controlled indexing rate shifter for a typewriter

Typewriting machines – For line-spacing by incremental rotation of platen – By pawl and ratchet wheel drive
Patent

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