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21.发明授权
公开(公告)号：US1694461A
公开(公告)日：1928-12-11
申请号：US4462925
申请日：1925-07-18
Applicant: SUN OIL CO
Inventor： GELLERT ALLEMAN
IPC: C11D9/00
CPC classification number: C11D9/00
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