United States Patent 2732950
US Patent References:
/0559439.html
- - 0559439

Gas filter
- - 2294107

Filter
- - 2322586

Filter
- - 2429321


Publication Date:
01/31/1956
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Primary Class:
210/186
Other Classes:
210/437
International Classes:
B01D29/00; B01D35/02; B01D35/18; D01D1/10; B01D37/00; B01D35/00; D01D1/00
Foreign References:
NL31875C
GB192009A