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公开(公告)号：US1786989A
公开(公告)日：1930-12-30
申请号：US24637128
申请日：1928-01-12
Applicant: HENRY A GARDNER LAB INC
Inventor： GARDNER HENRY A , KNAUSS CALVIN A
IPC: C08B7/00
CPC classification number: C08B7/00
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