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公开(公告)号：US2763119A
公开(公告)日：1956-09-18
申请号：US33135753
申请日：1953-01-15
Applicant: HELFELD ELMER C
Inventor： HELFELD ELMER C
CPC classification number: A01D87/06 , H05K3/325 , H05K2201/09072 , H05K2201/1031 , H05K2201/10469 , H05K2201/10636 , H05K2201/10643 , Y02P70/611
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