United States Patent 2692854
Inventors:
Alfred, Henley
Publication Date:
10/26/1954
Assignee:
AMERICAN INSTR COMPANY INC
Other Classes:
210/321.870, 366/204, 366/331, 210/645, 210/321.630, 366/318, 210/454, 366/250
International Classes:
B01D61/28; B01D61/24