Title:
Ventilating apparatus
Document Type and Number:
United States Patent 2775927

Inventors:
Wulle, William A.
Publication Date:
01/01/1957
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Assignee:
PYLE NATIONAL CO
Primary Class:
454/298
Other Classes:
285/401, 285/319, 285/240, 285/148.190, 454/903
International Classes:
F24F13/068; F24F13/06
US Patent References:
1143802
1499962Pipe joint
1864861Hose coupling
1921457Ventilator fitting
2180945Ventilating construction
2241773Vacuum cleaner
2251663Ventilating construction
2251682Ventilating construction
2413402Pipe coupler interlock
2448359Switch box holder
2458614Dust aspirator with a rotatable flexible tube connection
2461024Coupling device
2550810Means for cooling air or oxygen enriched air within an enclosure
2585666Distribution unit for ventilating systems
2662463Modular pressure-displacement type ventilating apparatus
2701998Ventilating apparatus
Foreign References:
GB375862A
GB474849A




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