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(en )
1936-12-01
Calculating machine
GB506013A
(enrdf_load_stackoverflow )
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1955-06-07
Swanson
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1956-07-31
Dodsworth
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1966-10-25
Credit balance transfer mechanism for ten-key
adding and subtracting machine
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(en )
1963-01-08
Control for motor operated business machines
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(en )
1951-10-09
Printing tabulating mechanism
US2809782A
(en )
1957-10-15
fleming
GB1088709A
(en )
1967-10-25
Margin setting device for a typewriter
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(en )
1958-09-30
Power operated tabulating mechanism
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(en )
1913-05-27
Adding attachment for type-writers.
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(en )
1910-02-08
Carrying mechanism for adders.
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(en )
1932-02-09
Computing machine
US1892614A
(en )
1932-12-27
renders
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(en )
1919-08-12
schoradt
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1913-08-12
Calculating-machine.
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(en )
1907-07-02
Adding-machine.
GB190920301A
(en )
1910-07-07
Mechanism for Setting and Restoring the Axially Slidable Pinions in Calculating Machines with only one Slidable Pinion for each Denominational Element.
GB416985A
(en )
1934-09-25
Improvements in or relating to calculating and the like machines
GB191121592A
(en )
1912-09-26
Improvements in or relating to Adding Machines.
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(en )
1906-07-05
Combined Typewriting and Adding Machine.
GB172917A
(enrdf_load_stackoverflow )
GB191421089A
(en )
1915-09-30
Improvements in or relating to Calculating Machines.
GB205870A
(en )
1923-10-24
Improvements in or relating to calculating machines
GB191205651A
(en )
1912-07-19
Improvements in and relating to Calculating Machines.