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公开(公告)号：US1901827A
公开(公告)日：1933-03-14
申请号：US54260431
申请日：1931-06-06
Applicant: STOKES ROBERT H , STOKES JAMES B
Inventor： STOKES ROBERT H , STOKES JAMES B
IPC: F04B9/04
CPC classification number: F04B9/047 , Y10T74/18288
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