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公开(公告)号：US2317821A
公开(公告)日：1943-04-27
申请号：US29668939
申请日：1939-09-26
Applicant: HERMANN STEIN
Inventor： HERMANN STEIN
IPC: A43C13/02 , B41J29/15 , C23C22/78 , F42B10/06 , F42B10/26 , G01R35/04 , G04C3/08 , G04F3/06 , H01F13/00
CPC classification number: H01F13/003 , A43C13/02 , B41J29/15 , C23C22/78 , G01R35/04 , G04C3/08 , G04F3/06
