58 Utility Patents
#1 in Tsukui
#5,640 in Japan
#28,673 in the World
Forward Citations = 1,284
Company Filing History:


Hitachi Engineering Co., Ltd.
4. 1 out of 182

5. 1 out of 7
Hitachi Elevator Engineering & Service Co., Ltd.
where one patent can have more than one assignee
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