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DE319727C
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Display or counter for adding machines, calculating machines, etc. like
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DE325900C
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Calculating machine with a revolution counter whose counting disks have two rows of digits offset from one another by a value division
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DE318676C
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Display or counter for adding machines, calculating machines, etc. like
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GB191401325A
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Improvements in and relating to Calculating Machines and the like.
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GB191223665A
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Improvements in Zeroizing Device for Calculating Machines.
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GB191223666A
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Improvements in Zeroizing Device for Calculating Machines.
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