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US3180572A
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Adding machine cover mechanisms
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US3154184A
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Platen adjusting means for typewriters
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US3129801A
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Power operated typewriter
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US3042300A
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Control mechanism for an adding machine
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US2999578A
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Ribbon change package
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US2946421A
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Case shift and related features
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US2950802A
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Paper guide shield for business machines
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US2946423A
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Ribbon spool cover arrangement in typewriter
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US2955695A
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Proportional letter-feeding and adjunct features
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US2941645A
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Varied-feed escapement and adjunct mechanisms
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US2980225A
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Apparatus to produce printed and control records and to utilize the latter for automatic control purposes
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US2942542A
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Combined type bar aligner and detent
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US2970926A
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Carbon paper
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US2905299A
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Data recording device or devices and programming means therefor
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US2913088A
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Differentially programmed typewriters and tape punch
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US2897942A
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Carriage overbanking elimination
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GB819284A
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Total taking mechanism in ten-key adding machines
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US2969176A
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Signal printing mechanism
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GB809523A
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Ten key adding and subtracting machine
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US2835369A
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Key interlock
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