Title:
Demonstrating device for suction cleaners
Document Type and Number:
United States Patent 2613454
Publication Date:
10/14/1952
Other Classes:
434/384, 55/503, 138/92, 96/417, 96/416, 55/481, 15/350, 210/447, 55/DIG.003, 55/493
International Classes:
A47L9/19; G09B25/02; A47L9/10; G09B25/00