GB1493809A
(en )
1977-11-30
Push button keyboard members
GB728580A
(de )
1900-01-01
US1166715A
(en )
1916-01-04
Calculating-machine.
GB280891A
(en )
1928-01-26
Improvements relating to calculating machines
GB1254639A
(en )
1971-11-24
Encoding keyboard
US2094883A
(en )
1937-10-05
Key control for auxiliary printing units
GB1105728A
(en )
1968-03-13
Key-operated electric circuit controller
GB517202A
(en )
1940-01-23
Improvements in push-button switches
GB191115221A
(en )
1912-06-27
Improvements in Cash Registers.
GB121508A
(en )
1918-12-16
Improvements in or relating to Keyboards for Typewriters.
US2055623A
(en )
1936-09-29
Calculating machine
GB1086120A
(en )
1967-10-04
Pushbutton unit having a variable switching programme
US1094468A
(en )
1914-04-28
Adding-machine.
US1028149A
(en )
1912-06-04
Adding-machine.
GB136630A
(en )
1919-12-17
Improvements in or relating to Calculating Machines Combined with Typewriters.
GB191019976A
(en )
1911-08-24
Improvements in Cash Registers and Autographic Devices therefor.
GB190023854A
(en )
1901-03-09
Improvements in Typewriters.
GB168537A
(en )
1921-09-08
Improvements relating to means for holding in close contact a movable truck and stationary cubicle of an electric switchboard or other relatively movable members
GB795089A
(en )
1958-05-14
Improvements in or relating to push-button switch assemblies for wireless sets and the like
GB190204667A
(en )
1903-01-15
Improvements in or relating to Type Setting Machines.
GB189900449A
(en )
1899-11-25
An Improved Method of Controlling Certain of the Stops and Couplers in an Organ.
GB191019211A
(en )
1911-08-16
Improvements relating to Calculating Machines.
GB199564A
(en )
1923-06-28
Improvements in press-button switches for electrical circuits
GB190710428A
(en )
1908-01-30
Improvements in or relating to Cash Registering Tills.
GB851509A
(en )
1960-10-19
Improvements in or relating to electric switch mechanisms