GB259470A
(https= )
US1730147A
(en )
1929-10-01
horton
US1951592A
(en )
1934-03-20
Cipher eliminating mechanism
US2938615A
(en )
1960-05-31
Type bar drive
US2229980A
(en )
1941-01-28
Computing machine
US1613129A
(en )
1927-01-04
A corpxs o
US3021935A
(en )
1962-02-20
Mechanical interlock device
US2285311A
(en )
1942-06-02
Accounting machine
US960853A
(en )
1910-06-07
Adding and recording machine.
GB144543A
(https= )
US1669996A
(en )
1928-05-15
naumann
GB337478A
(https= )
US666648A
(en )
1901-01-29
Cash-register.
US2702622A
(en )
1955-02-22
Paper feeding means in accounting machines
US1561870A
(en )
1925-11-17
Word-counting attachment for typewriters
GB609077A
(https= )
GB431961A
(https= )
GB191227768A
(en )
1913-11-27
Improvements in and relating to Keyboard and Interlocking Mechanism for Cash Registers and the like.
US1207275A
(en )
1916-12-05
Word-counting attachment for type-writing machines.
GB191403084A
(en )
1915-02-04
Improvements in Adding Machines.
GB628636A
(https= )
GB321952A
(en )
1929-11-20
Improvements in punching or like machines for operating upon record or like cards
GB183867A
(en )
1922-07-26
Improvements relating to apparatus for compiling and printing statistics from perforated record cards
GB293080A
(https= )
GB394322A
(https= )