YH

Yoshiji Hiraoka

HC Hiraoka & Co.: 1 patents #2 of 5Top 40%
Overall (1982): #22,204 of 81,411Top 30%
1
Patents 1982

Issued Patents 1982

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4312907 Water-impermeable sheet material Tsutomu Obayashi 1982-01-26