Filter elements
United States Patent 2789563

Inventors:
Ivan, Taylor William
William, Grebby John
Publication Date:
04/23/1957
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Assignee:
British, Celanese
Primary Class:
131/343
Other Classes:
131/345
International Classes:
A24D3/10; A24D3/00
US Patent References:
2342924Cigarette mouthpiece material
2476582Method of making filter units
Foreign References:
AU121414B
GB451683A