United States Patent 2474690
Inventors:
Robinson, Lawrence R.
Robinson, Kyle I.
Berger, Earl O.
Publication Date:
06/28/1949
Assignee:
Pittsburgh, Pipe Cleaner Compan
Other Classes:
403/306, 403/286, 138/134, 138/178, 15/104.061, 138/131, 59/79.200
International Classes:
B08B9/04; B08B9/02