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US3997046A
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Flexible correction auxiliaries for use with golf-ball typewriters
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US3997047A
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Attachment for converting a standard typewriter into a correcting typewriter
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US3927749A
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Apparatus for supplementing the operation of the ribbon selecting and backspacing means of a typewriter
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US3927748A
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Attachment for converting a standard typewriter to a self-correcting typewriter
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US3927746A
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Typing and correcting cartridge for single-element typewriters
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US3927747A
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Printing machine in which the ribbons in two different cartridges may be selectively used
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US3149711A
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Error-correcting typewriter
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US3154183A
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Ribbon shift for error-obliterating typewriters
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US3114447A
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Ribbon for typing and obliterating
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US2634911A
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Record card with selective conductive marks
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US2666655A
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Identification card or the like
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US2557022A
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Method of preparing record cards with conductive marks
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US2520077A
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Printing identification plate or the like
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US2582187A
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Printing machine for duplicating indicia
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US2568427A
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Stamp carrier card
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US2540704A
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Reversible printing plate
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CA489365A
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Method of preparing record cards with conductive marks
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CA470831A
|
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Printing identification plates or the like
|
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CA738253A
|
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Typewriter correction ribbon and method
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CA756893A
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Two-component printing ribbon and method of making
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