3 Patents
#3,271 in Tokyo
#8,780 in Japan
Sumitomo Coal Mining Co., Ltd.
Forward Citations = 23
4 inventors:
4 inventors (with patents filed for the assignee):
Masao Tokita (3 out of 5 patents)
Yoshito Miyasaka (1 out of 3 patents)
Hitoshi Karasawa (1 out of 3 patents)
4. Fumitake Nishiyama (1 out of 2 patents)
3 patents:
#3,271 in Tokyo
#8,780 in Japan
4 inventors: