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1900-01-01
US2139718A
(en )
1938-12-13
Cash register
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(en )
1961-11-14
Complemental keyboard
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1940-04-30
Transfer mechanism for key-set
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GB600446A
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GB516693A
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GB516535A
(cg-RX-API-DMAC10.html )
GB191107105A
(en )
1911-08-09
Improvements in and relating to Adding Mechanism for Cash Registers and the like.
GB712750A
(en )
1954-07-28
Improvements in or relating to calculating machines
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1900-01-01
GB783849A
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GB191414137A
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1915-06-11
Improvements in Cash Registers or the like.
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