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公开(公告)号：US1336204A
公开(公告)日：1920-04-06
申请号：US32982219
申请日：1919-10-10
Applicant: E INGRAHAM COMPANY INC
Inventor： CROUCH WALTER L , RUST ARTHUR E
IPC: G04B19/14
CPC classification number: G04B19/14
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