Hokkaido Railway Company

Hirohiko Kakinuma (2 out of 2 patents)

Iwao Sato (2 out of 2 patents)

Hideki Nakamura (1 out of 89 patents)

4.  Tomonori Kamaka (1 out of 1 patent)

5.  Yoji Shimokawa (1 out of 1 patent)

6.  Susumu Inagaki (1 out of 1 patent)

7.  Tomoaki Kito (1 out of 1 patent)

8.  Hiroyuki Ihara (1 out of 1 patent)

9.  Tadashi Inaba (1 out of 1 patent)

10.  Ryo Karasawa (1 out of 1 patent)

11.  Takahiro Ono (1 out of 1 patent)

12.  Sato Iwao (0 patent)

13.  Kakinuma Hirohiko (0 patent)

14.  Shimokawa Yoji (0 patent)

15.  Kamaka Tomonori (0 patent)