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公开(公告)号：US756766A
公开(公告)日：1904-04-05
申请号：US1903162291
申请日：1903-06-19
Applicant: YOCUM ELRA A , SWIHART JAMES A
Inventor： YOCUM ELRA A , SWIHART JAMES A
CPC classification number: F04B9/02 , F15B15/065 , Y10T74/18976
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