GB770319A
(enExample )
US1957501A
(en )
1934-05-08
Method and means for obtaining true
US2087182A
(en )
1937-07-13
Listing adding machine
US2710139A
(en )
1955-06-07
Swanson
US2447108A
(en )
1948-08-17
T avery
US2731197A
(en )
1956-01-17
Pin box control mechanism
US1915296A
(en )
1933-06-27
crosman
US1630814A
(en )
1927-05-31
Cash register
USRE17466E
(en )
1929-10-22
chase
GB172917A
(enExample )
GB650357A
(en )
1951-02-21
Differential setting mechanism for cash registers or similar accounting machines
US3374946A
(en )
1968-03-26
Computer for multiplication with abbreviated,continual addition or subtraction
US1829210A
(en )
1931-10-27
A corpobation of dela
US1935609A
(en )
1933-11-21
Total key unlocking means for adding machines
US2048842A
(en )
1936-07-28
Listing
GB675363A
(enExample )
GB699954A
(en )
1953-11-18
Improvements in computing machines
GB903879A
(enExample )
GB407030A
(en )
1934-03-06
Improvements in or relating to record card controlled tabulating machines
GB721535A
(enExample )
GB723864A
(enExample )
GB417991A
(enExample )
1900-01-01
GB317014A
(en )
1930-12-08
Improvements in or relating to calculating or accounting machines
GB686524A
(enExample )
GB191309102A
(en )
1914-05-18
Improvements in or relating to Adding, Listing and like Machines.