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Vacuum cleaning apparatus
US 2,397,980 A
Filed
: 11/25/1943
Issued
: 04/09/1946
Est. Priority Date
: 11/25/1943
Status: Expired due to Term
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32 Citations
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Current Assignee
Frederick W. Petrl
Original Assignee
Frederick W. Petrl
Inventors
Petrl, Frederick W.
Application Number
US02/511,659
Time in Patent Office
866 Days
Field of Search
US Class Current
55/426
CPC Class Codes
A47L 5/22
with rotary fans
A47L 9/1608
Cyclonic chamber constructions
A47L 9/165
Construction of inlets
A47L 9/1666
with filtering means
A47L 9/1691
Mounting or coupling means ...
A47L 9/22
Mountings for motor fan ass...
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