KK

Kei Koyama

RC Rion Co.: 2 patents #29 of 139Top 25%
Overall (All Time): #1,894,394 of 4,157,543Top 50%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
D938595 Earphone Takashi Iwakura, Akihiro Soeta 2021-12-14
10542348 Electromechanical transducer Takashi Iwakura, Fumitaka Funahashi 2020-01-21