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公开(公告)号：US3358984A
公开(公告)日：1967-12-19
申请号：US34263764
申请日：1964-02-05
Applicant: LOIRE ATEL FORGES
Inventor： HENRI GRASSIN , PIERRE MEYNARD
CPC classification number: C21C5/50 , C21C5/4633
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