US2121683A
(en )
1938-06-21
Calculating machine
US1738144A
(en )
1929-12-03
morton
GB765291A
(enExample )
GB425691A
(en )
1935-03-20
Improvements in or relating to power operated typewriters
US2668011A
(en )
1954-02-02
Total control mechanism for accounting machines
GB484821A
(enExample )
GB190902119A
(en )
1909-09-30
Improvements in or relating to Adding Machines.
US2365874A
(en )
1944-12-26
Computing machine
GB693659A
(enExample )
GB172917A
(enExample )
GB499826A
(enExample )
US2055623A
(en )
1936-09-29
Calculating machine
GB939893A
(enExample )
GB487494A
(enExample )
GB500580A
(en )
1939-02-13
Improvements in or relating to calculating machines
GB464746A
(enExample )
GB191119694A
(en )
1912-09-04
Adding and Computing Machine.
GB648922A
(enExample )
GB783875A
(enExample )
GB474938A
(enExample )
GB1030318A
(enExample )
GB229302A
(enExample )
GB934746A
(en )
1963-08-21
A keyboard assembly for a cash register or similar accounting machine
GB265122A
(enExample )
GB540312A
(enExample )