GB181664A
(https= )
US2121683A
(en )
1938-06-21
Calculating machine
US2298202A
(en )
1942-10-06
Listing calculator
US1203863A
(en )
1916-11-07
Mechanical calculator.
US2678160A
(en )
1954-05-11
Key-responsive recording
US2636679A
(en )
1953-04-28
Keyboard clearing mechanism
US2055623A
(en )
1936-09-29
Calculating machine
US2590335A
(en )
1952-03-25
Selective keyboard clearing means
GB909935A
(en )
1962-11-07
Calculating or similar accounting machine
GB483113A
(https= )
US1858290A
(en )
1932-05-17
Joooooooooooo
GB191403085A
(en )
1915-02-04
Improvements in Calculating Machines.
GB191424723A
(en )
1915-10-21
Improvements in and relating to Calculating Machines.
US1738144A
(en )
1929-12-03
morton
GB608989A
(en )
1948-09-23
Improvements in calculating machines
GB190419725A
(en )
1904-11-03
Improvements in Calculating Machines.
GB464746A
(https= )
US1102157A
(en )
1914-06-30
Adding mechanism.
GB628636A
(https= )
GB191403083A
(en )
1915-02-05
Improvements in Adding Machines.
GB172917A
(https= )
GB555659A
(en )
1943-09-01
Improvements in or relating to calculating or like machines
GB191120596A
(en )
1912-09-05
Improvements in Printing Mechanism for Adding Machines.
GB939893A
(https= )
GB447485A
(https= )