GB166488A
(enrdf_load_stackoverflow )
GB1172819A
(en )
1969-12-03
Keyboard Mechanisms.
US2656980A
(en )
1953-10-27
Key operating means for computing machines
US2727689A
(en )
1955-12-20
Ten digit keyboard for calculating machine
US20240126379A1
(en )
2024-04-18
Computer keyboard with telephone keypad, and electronic equipment
CN201107734Y
(zh )
2008-08-27
一种改进的计算机键盘
US2803714A
(en )
1957-08-20
Multiple pole electrical typewriter key
US1195575A
(en )
1916-08-22
gardner
US1270855A
(en )
1918-07-02
Adding-machine.
GB1122887A
(en )
1968-08-07
A data entry machine
GB925165A
(enrdf_load_stackoverflow )
GB298114A
(enrdf_load_stackoverflow )
US1100929A
(en )
1914-06-23
Calculating-machine.
GB263505A
(enrdf_load_stackoverflow )
GB1154111A
(en )
1969-06-04
Encoder.
GB698327A
(en )
1953-10-14
Improvements in or relating to keyboard operators for typewriters and other like type-selecting machines
GB570356A
(en )
1945-07-03
Improvements in or relating to machines for making records on statistical cards
CN119937801A
(zh )
2025-05-06
一种电脑键盘及电子设备
GB158197A
(enrdf_load_stackoverflow )
GB191126171A
(en )
1912-11-21
Improvements in and relating to Cash Registers.
GB225124A
(en )
1924-11-27
Improvements in typewriting and calculating machines
CN2828911Y
(zh )
2006-10-18
一种改进的计算机键盘
GB147763A
(enrdf_load_stackoverflow )
GB841059A
(enrdf_load_stackoverflow )
1900-01-01
GB191504131A
(en )
1916-03-16
Improvements in or relating to Calculating Machines.