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公开(公告)号：US2661495A
公开(公告)日：1953-12-08
申请号：US28161952
申请日：1952-04-10
Applicant: AMERICAN GRAVITY DOOR CLOSER I
Inventor： KORNELIUS KALLEBERG
IPC: E05F1/06
CPC classification number: E05F1/065 , E05Y2201/604 , E05Y2201/638 , E05Y2201/688 , Y10T16/537 , Y10T16/53987
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