8 Utility Patents
#157 in Isehara
#105,167 in Japan
#499,816 in the World
Forward Citations = 140
Company Filing History:

Hitachi, Ltd.
Nippon Telephone and Telegraph Corporation
4. 2 out of 6
Hitachi Service Engineering Co., Ltd.
5. 1 out of 2
Hitachi Service Engineering, Ltd.
where one patent can have more than one assignee
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