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YOKOYAMA YOSHIMASA

3 patents

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US4669986AJun 2, 1987

Writing training device

YOKOYAMA YOSHIMASA49 citations92

US4126958ANov 28, 1978

Fumigator for mosquito coil

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US9020260B2Apr 28, 2015

Image processing apparatus, image processing method and recording medium

YOKOYAMA YOSHIMASA1 citations51