Yukimasa Okumura

Yamaha: 2 patents #11 of 188Top 6%

Overall (2004): #32,986 of 270,089Top 15%

Patents 2004

Issued Patents 2004

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
6762353	Percussion instrument head	—	2004-07-13
6689944	Drum acoustic wire and drum	—	2004-02-10