Visual-audible alarm for a vacuum cleaner
United States Patent 3381652
US Patent References:
Structure for indicating need for removing suction cleaner dust bag
- - 2750915
Device for indicating fluid flow
- - 3119369
Device for signalling need for cleaning or replacing suction cleaner dust bag
- - 3279418
Structure for indicating need for removing suction cleaner dust bag
- - 2750915
Device for indicating fluid flow
- - 3119369
Device for signalling need for cleaning or replacing suction cleaner dust bag
- - 3279418
Inventors:
Schaefer, Harold W.
Bruning, Elmer E.
Bruning, Elmer E.
Publication Date:
05/07/1968
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Export Citation:
Assignee:
NAT UNION ELECTRIC CORP
Primary Class:
Other Classes:
15/339, 116/70
International Classes:
A47L9/19; G08B21/20; A47L9/10; G08B21/00