US2080457A
(en )
1937-05-18
Keyboard for typewriters
GB147763A
(https= )
GB1172819A
(en )
1969-12-03
Keyboard Mechanisms.
US2656980A
(en )
1953-10-27
Key operating means for computing machines
GB1139391A
(en )
1969-01-08
Power driven type bar actuating mechanism
US3324985A
(en )
1967-06-13
Encoder
GB1084690A
(https= )
GB344380A
(https= )
GB570356A
(en )
1945-07-03
Improvements in or relating to machines for making records on statistical cards
GB1243640A
(en )
1971-08-25
Selectively operable mechanism for keyboard operating machines
US3750796A
(en )
1973-08-07
Self-interlocking keyboard
GB166488A
(https= )
GB228184A
(https= )
GB362451A
(https= )
GB298114A
(https= )
GB526703A
(https= )
GB420431A
(https= )
GB191219273A
(en )
1913-03-13
Improvements in the Keyboards and Connecting Members of Calculating Machines.
GB208232A
(https= )
GB550496A
(https= )
GB672771A
(https= )
GB373131A
(https= )
GB206467A
(https= )
GB146792A
(https= )
GB191309877A
(en )
1914-04-23
Improvements in Registering Mechanism for Cash Registers, Calculating Machines and Registering and the like Apparatus.