HU

Hirohisa Umezaki

MC Mine Safety Appliances Company: 1 patents #104 of 243Top 45%
📍 Fujiidera, JP: #50 of 71 inventorsTop 75%
Overall (All Time): #3,598,184 of 4,157,543Top 90%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
6309438 Filter unit and dust-proof mask therewith Tomoaki Kanno, Kunio Yamada 2001-10-30