US2221861A
(en )
1940-11-19
Calculating machine
GB550978A
(en )
1943-02-03
Improvements in or relating to calculating or similar accounting machines
GB265122A
(da )
US1908358A
(en )
1933-05-09
And detroit totst cqwpawz
US3023951A
(en )
1962-03-06
Control apparatus for accounting machines
US1630814A
(en )
1927-05-31
Cash register
GB909935A
(en )
1962-11-07
Calculating or similar accounting machine
US2027449A
(en )
1936-01-14
Calculating machine and cash
US2089310A
(en )
1937-08-10
Bookkeeping machine
US1915624A
(en )
1933-06-27
shipley
GB497640A
(da )
US1883892A
(en )
1932-10-25
Walther flach
GB420807A
(da )
1900-01-01
GB749504A
(da )
GB205870A
(en )
1923-10-24
Improvements in or relating to calculating machines
GB490524A
(da )
GB523064A
(da )
GB852822A
(da )
GB285885A
(da )
GB539453A
(da )
GB191403084A
(en )
1915-02-04
Improvements in Adding Machines.
GB190828253A
(en )
1909-12-28
Improvements in and relating to Mechanical Calculators.
GB474938A
(da )
GB534146A
(da )
GB483093A
(da )