GB753006A
(enExample )
GB1172819A
(en )
1969-12-03
Keyboard Mechanisms.
GB1082776A
(en )
1967-09-13
Keyboard mechanism for generating code combinations
US2451090A
(en )
1948-10-12
Key locking mechanism
GB1122887A
(en )
1968-08-07
A data entry machine
GB537735A
(enExample )
GB231515A
(enExample )
GB608988A
(enExample )
GB474938A
(enExample )
GB191129373A
(en )
1912-11-28
Improvements in or relating to Adding and Listing or like Machines.
GB765291A
(enExample )
GB431623A
(enExample )
GB765450A
(enExample )
GB453280A
(enExample )
GB275968A
(enExample )
GB191229804A
(en )
1913-07-10
Improvements in Tabulating Mechanism for Typewriting Machines.
GB799137A
(en )
1958-08-06
Improvements in contact keyboards for controlling typewriters and calculating, accounting and like machines
GB189715796A
(en )
1897-08-14
Improvements in Type-writing Machines.
GB344393A
(enExample )
GB274850A
(enExample )
GB732760A
(enExample )
GB852822A
(enExample )
GB1112342A
(en )
1968-05-01
Improvements in or relating to typewriters for producing code signals
GB1335057A
(en )
1973-10-24
Calculating machines
GB614346A
(enExample )