Combined switch-box and vacuum-line-seal mechanism for vacuum-cleaning systems
United States Patent 1618667

Inventors:
Melcher, Irving W.
Publication Date:
02/22/1927
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Assignee:
Theodore, Ware C.
Primary Class:
200/61.600
Other Classes:
15/DIG.010, 200/331, 137/360, 55/DIG.034, 55/DIG.008, 138/89, 200/330, 15/314
International Classes:
A47L5/38; A47L9/24; A47L5/22