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KOYAMA OSAMU

JP2 patents

Top patents by PatentIndex Score

US11138988B2Oct 5, 2021

Playing method for playing multi-language contents for education, and data structure and program therefor

KOYAMA OSAMU0 citations47

US8909092B2Dec 9, 2014

Process cartridge and electrophotographic image forming apparatus to charge a photosensitive drum

KOYAMA OSAMU0 citations35