05109354 is referenced by 57 patents and cites 7 patents.

An electronic system pocketbook apparatus includes a foldable and portable main body, an expansion card holder mounted on the main body, a necessary number of expansion cards held by the expansion card holder, and a communicating unit. The main body has a functions of right and left portions coupled by a cover, is folded upon carrying of the main body so that the right portion overlaps the left portion, a folded portion being fastened by a cover clip provided to the cover, and has basic functions of controlling arithmetic operations and display data processing by using an internal controller, data inputting means, and displaying data on a display unit. The communicating unit performs data transmission/reception between the held expansion cards and the main body via the expansion card holder.

Title
Electronic system pocketbook apparatus
Application Number
7/502563
Publication Number
5109354
Application Date
March 30, 1990
Publication Date
April 28, 1992
Inventor
Eiji Takeuchi
Tokyo
JP
Hiroaki Yoshida
Tokyo
JP
Yoshiaki Kitamura
Tokyo
JP
Satoshi Endoh
Tokyo
JP
Kazuo Nagamachi
Tokyo
JP
Shinichi Midorikawa
Tokyo
JP
Kazuya Kiuchi
Tokyo
JP
Haruhiro Kikkawa
Tokyo
JP
Hiromasa Yamashita
Ise
JP
Agent
Spensley Horn Jubas & Lubitz
Assignee
Kyocera Corporation
JP
IPC
G06F 15/02
View Original Source