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GB1215883A
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Improvements in or relating to calculatin machines
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DE1574551A1
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Locking device for the racks on ten-key calculating machines that are missing the adjusting pins
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GB1198865A
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Calculating Machine
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Ten Key Calculating Machine
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DE1524078A1
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Device for automatic abbreviated multiplication on calculating machines, especially balancing machines
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GB960108A
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A setting and printing mechanism for calculating machines
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GB774839A
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Improvements in calculating apparatus
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DE1104231B
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Switching lock for arithmetic unit slide
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US2840313A
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Transfer mechanism for calculating machines
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