Means for preventing clogging of drain troughs
United States Patent 2533402
US Patent References:
/0317011.html
- - 0317011

/0571776.html
- - 0571776

/0643747.html
- - 0643747


Inventors:
Schmitz Jr., William R.
Publication Date:
12/12/1950
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Assignee:
Schmitz Jr., William R.
Primary Class:
210/463
Other Classes:
52/12, 210/497.200, 210/477
International Classes:
E04D13/04; E04D13/076
Foreign References:
GB187402865A