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公开(公告)号：US1508072A
公开(公告)日：1924-09-09
申请号：US41473720
申请日：1920-10-05
Applicant: PLANET COMPANY
Inventor： SCHAPPA ALBERT M , ROBERT GOWDY
IPC: E04H1/12
CPC classification number: E04H1/1255
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