US1849169A
(en )
1932-03-15
Calculating machine
GB479234A
(enExample )
1900-01-01
GB601375A
(enExample )
US3072329A
(en )
1963-01-08
Control for motor operated business machines
GB496720A
(enExample )
GB518837A
(enExample )
GB720088A
(enExample )
GB566376A
(enExample )
GB191210902A
(en )
1913-06-09
Combined Typewriting and Computing Machine.
GB508141A
(enExample )
GB509444A
(enExample )
GB712750A
(en )
1954-07-28
Improvements in or relating to calculating machines
US1396716A
(en )
1921-11-08
magnus
GB423169A
(en )
1935-01-24
Improvements in or relating to calculating and the like machines
GB395688A
(enExample )
GB205870A
(en )
1923-10-24
Improvements in or relating to calculating machines
GB606629A
(enExample )
GB903879A
(enExample )
GB417991A
(enExample )
1900-01-01
GB752591A
(en )
1956-07-11
Improvements in or relating to calculating machines
GB672210A
(enExample )
GB753841A
(enExample )
GB487494A
(enExample )
GB191119694A
(en )
1912-09-04
Adding and Computing Machine.
GB741583A
(enExample )