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公开(公告)号：US2635014A
公开(公告)日：1953-04-14
申请号：US11562849
申请日：1949-09-14
Applicant: GETTY ELLSWORTH J , CLAPP REVERE E
Inventor： GETTY ELLSWORTH J , CLAPP REVERE E
IPC: E04G1/18
CPC classification number: E04G1/18
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