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公开(公告)号：US2975449A
公开(公告)日：1961-03-21
申请号：US69791957
申请日：1957-11-21
Applicant: BISSELL INC
Inventor： LIDDELL ROBERT E , KUYPERS NORBERT T , YONKERS ROBERT A
IPC: A47L11/33
CPC classification number: A47L11/4075 , A47L11/33 , A47L11/40 , A47L11/4013 , A47L11/4025 , A47L11/4069
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