US3151722A
(en )
1964-10-06
Spring actuated typewriter action with fault sensing means
GB259470A
(enrdf_load_stackoverflow )
US1730147A
(en )
1929-10-01
horton
US2938615A
(en )
1960-05-31
Type bar drive
US1613129A
(en )
1927-01-04
A corpxs o
US2740582A
(en )
1956-04-03
parker
US2818961A
(en )
1958-01-07
Electronic tabulation
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
(enrdf_load_stackoverflow )
GB904426A
(en )
1962-08-29
Cash registers and similar accounting machines
US1669996A
(en )
1928-05-15
naumann
GB337478A
(enrdf_load_stackoverflow )
US666648A
(en )
1901-01-29
Cash-register.
US2702622A
(en )
1955-02-22
Paper feeding means in accounting machines
US2886237A
(en )
1959-05-12
Certificate of correction
US1561870A
(en )
1925-11-17
Word-counting attachment for typewriters
GB431961A
(enrdf_load_stackoverflow )
GB295632A
(enrdf_load_stackoverflow )
GB191227768A
(en )
1913-11-27
Improvements in and relating to Keyboard and Interlocking Mechanism for Cash Registers and the like.
GB191403084A
(en )
1915-02-04
Improvements in Adding Machines.
GB628636A
(enrdf_load_stackoverflow )
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