4. Recorders
  5. Magnetographic

Donald A. Walker

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Electrically conductive ribbon break detector for printers

Typewriting machines – Including interposed inking device for record-medium – Means auxiliary to ribbon mechanism
Patent

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Method for writing and viewing magnetic human readable character

Recorders – Magnetographic
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Ribbon guiding for thermal lift-off correction

Typewriting machines – Means auxiliary to typewriting function – Means for correcting typing errors
Patent

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Profile ID: LFUS-PAI-P-556842

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