Assignee

YAMAMOTO KK

JP·1 granted patent·19 citations·filing 1985–1985

Technology mixB21H1 B21K1 B23H1

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0168US4793220AMethod of making a drill-shaped cutting tool and thread rolling diesYAMAMOTO KK·Filed 1985·Granted Dec 27, 1988·19 cites·7 claims

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