US3151722A
(en )
1964-10-06
Spring actuated typewriter action with fault sensing means
US2424359A
(en )
1947-07-22
Adding machine
GB447485A
(enrdf_load_stackoverflow )
US3342295A
(en )
1967-09-19
Repeat action mechanism for power operated typewriters
US3718243A
(en )
1973-02-27
Apparatus for storing typing commands given in too rapid succession by keys
GB676195A
(en )
1952-07-23
Improvements in and relating to typing and justifying machines
US3045799A
(en )
1962-07-24
Keyboard interlock control means
US3814228A
(en )
1974-06-04
Repeat mechanism for a printer
US2938615A
(en )
1960-05-31
Type bar drive
US2971625A
(en )
1961-02-14
Repeat actuation arrangement for typewriters
US2383260A
(en )
1945-08-21
Typewriting machine
US2055623A
(en )
1936-09-29
Calculating machine
US2702622A
(en )
1955-02-22
Paper feeding means in accounting machines
US3664478A
(en )
1972-05-23
Mutual locking device for an office machine with electric keyboard
US2633966A
(en )
1953-04-07
Operation control interlocking mechanism for typewriters or like machines
US2223235A
(en )
1940-11-26
Typewriting machine
US3003688A
(en )
1961-10-10
Menge
US2996165A
(en )
1961-08-15
Letter space extend mechanism for typewriters
US2451722A
(en )
1948-10-19
Power-operated skip tabulating mechanism for typewriting machines
US1738144A
(en )
1929-12-03
morton
US3698530A
(en )
1972-10-17
Case shift control apparatus operable by a case shift key and by type keys
US2749040A
(en )
1956-06-05
Motor bar interlock
US1238065A
(en )
1917-08-21
Combined type-writing and computing machine.
US4235554A
(en )
1980-11-25
Keyboard signal storage mechanism
GB631379A
(enrdf_load_stackoverflow )