GB283486A
(https= )
US2121683A
(en )
1938-06-21
Calculating machine
US1738144A
(en )
1929-12-03
morton
GB765291A
(https= )
GB425691A
(en )
1935-03-20
Improvements in or relating to power operated typewriters
GB484821A
(https= )
GB190902119A
(en )
1909-09-30
Improvements in or relating to Adding Machines.
US2365874A
(en )
1944-12-26
Computing machine
GB693659A
(https= )
GB172917A
(https= )
GB499826A
(https= )
US2055623A
(en )
1936-09-29
Calculating machine
GB939893A
(https= )
GB487494A
(https= )
GB500580A
(en )
1939-02-13
Improvements in or relating to calculating machines
GB464746A
(https= )
GB191119694A
(en )
1912-09-04
Adding and Computing Machine.
GB648922A
(https= )
GB783875A
(https= )
GB474938A
(https= )
GB229302A
(https= )
GB934746A
(en )
1963-08-21
A keyboard assembly for a cash register or similar accounting machine
GB540312A
(https= )
GB555659A
(en )
1943-09-01
Improvements in or relating to calculating or like machines
GB191124565A
(en )
1912-11-04
Improvements in or relating to Adding Machines.