13 Utility and 2 Design Patents
#3,864 in Yokohama
#63,450 in Japan
#297,024 in the World
rank by utility patentsForward Citations = 259
Company Filing History:
Nhk Spring Co., Ltd.

Tokyo Electric Co.
4. 1 out of 39,212

5. 1 out of 7

where one patent can have more than one assignee
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