Fan
United States Patent 3395761
US Patent References:
Fan
- - 2032224

Fan
- - 2132133

Fan
- - 2149267

Propeller
- - 2399828

Fluid pump with direction responsive impeller blades
- - 2570862


Inventors:
Walter, Holzer
Publication Date:
08/06/1968
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Primary Class:
416/136
Other Classes:
416/3, 416/132R, 416/132A, 416/135, 416/142
International Classes:
F04D29/36; F04D29/32
US Patent References:
2251887Flexible fan unit
1835284Circulating device for hot water heating systems
Foreign References:
FR939847A
GB191669A
GB528439A
AT100913B
DE757714C
FR718786A
GB634486A