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(en )
2001-01-23
Multiple sprocket assembly for a bicycle
US3031901A
(en )
1962-05-01
Twelve speed power shift planetary transmission
GB480242A
(enrdf_load_stackoverflow )
US2737064A
(en )
1956-03-06
Epicyclic control gear
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(de )
2001-05-23
Tretkurbelantrieb für ein fahrrad
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1977-07-05
Rotary date stamp
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1961-11-28
Printing machines
GB656185A
(enrdf_load_stackoverflow )
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1902-10-21
Numbering-machine.
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1918-12-24
Adding and subtracting machine.
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1907-09-10
Calculating-machine.
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1953-07-14
Predetermined counter value setting device
GB613851A
(enrdf_load_stackoverflow )
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1928-01-31
A corpora
GB493753A
(en )
1938-10-13
Improvements in and relating to totaliser actuating and printing means for calculating machines and similar apparatus
GB656601A
(enrdf_load_stackoverflow )
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1905-12-12
Numbering-machine.
GB704337A
(enrdf_load_stackoverflow )
GB483951A
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1938-04-28
Revolution counter
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1932-05-10
Calculating and listing machine
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1938-02-14
Improvements in or relating to calculating machines
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1993-05-26
文学常识速查盘
GB353904A
(enrdf_load_stackoverflow )
CN201262719Y
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2009-06-24
九珠记位算盘
GB189918799A
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1900-07-28
Improvements in Free-wheel Bicyles and other Velocipedes and in Brakes for the same.