Hitachi, Ltd.

Katsuki Ikuta

Hiroshi Shimizu

Naoki Yamamoto

Tadashi Kuwabara

Yutaka Igarashi

Tamotsu Ito

Tsukasa Hasegawa

Shinichiro Fukushima

Yukinobu Tada

Toru Numata

Masayoshi Kuroda

Mayumi Ueyama

Maki Furui

Rituko Kanazawa

Misuzu Mochizuki

There is provided a cellular phone taking into consideration enhancement in processing speed and reduction in current consumption, and the cellular phone comprises a processing unit capable of executing plural kinds of processing, an oscillator for generating a clock signal to be fed to the processing unit, and a clock controller for converting the frequency of the clock signal received from the oscillator, wherein the clock controller changes the frequency of the clock signal for each of the plural kinds of the processing in response to the control by the central processing unit.

Mobile terminal

For changing services to readers who desires to obtain electronic books exactly or minutely, an electronic book management systemdistributes at least electronic purchase certificates relating to books which are stocked at a bookstores owing a bookstore terminal device, in advance, to that bookstore terminal device. When buying the book(s), a reader obtains in an IC cardowned by her/him a purchase certificate(s) of that book(s) which she/he bought, from the bookstore terminal. When ordering to obtain the electronic book(s), the reader transmits the purchase certificate(s) from a reader terminal deviceto the electronic book management systemthrough a communication network. The electronic book management systemchanges over it's service when supplying the electronic book(s) to that reader depending upon the existence of the purchase certificate(s).

Electronic book distributing system by use of purchase certificate and devices therefor

Growing community of inventors

Hachioji, Japan

Katsuki Ikuta