4. Typewriting machines
  5. Typing by other than type-face or type-die
  6. Thermal

United Systems Corporation

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High power and high voltage transistor control circuit

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
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Print medium advancing mechanism including print head retraction

Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent

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