US5974000A
(en )
1999-10-26
Tactile actuated electronic computer wrist watch
EP0365305A3
(en )
1991-07-24
Data processing device
GB497462A
(enExample )
GB1238920A
(enExample )
1971-07-14
US4724423A
(en )
1988-02-09
Character input system
GB450591A
(enExample )
GB925165A
(enExample )
GB681036A
(enExample )
GB190505115A
(en )
1905-12-07
Improvements in Calculating Machines.
GB1199148A
(en )
1970-07-15
Data Capture
CN201322907Y
(zh )
2009-10-07
笔记本电脑键盘
GB1079594A
(en )
1967-08-16
Improvements in or relating top fluid pressure operated calculating machines
GB335213A
(enExample )
GB166488A
(enExample )
KR790001246B1
(ko )
1979-09-17
전자 계산기를 겸용할 수 있는 전자식 판매기록기
CN1084499C
(zh )
2002-05-08
便用式新型电子计算器
JPS55154656A
(en )
1980-12-02
Electronic cash register
KR200214144Y1
(ko )
2001-02-15
수식입력키보드
JPS5736359A
(en )
1982-02-27
Electronic cash register
JPH0455692U
(enExample )
1992-05-13
JPS55127660A
(en )
1980-10-02
Key input system of electronic cash register
US1474533A
(en )
1923-11-20
Decimal-point calculator
Smith
1972
The Hewlett-Packard 9810 Desk Calculator and its Predecessors
JP3076838U
(ja )
2001-04-20
電子辞典
GB1428211A
(en )
1976-03-17
Numerical data input apparatus