Paraffin cutter
United States Patent 3171487
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Inventors:
Ault, Isaac L.
Publication Date:
03/02/1965
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Assignee:
Ault, Isaac L.
Primary Class:
166/66.500
Other Classes:
166/70, 166/170
International Classes:
E21B37/04; E21B37/00
US Patent References:
3031971Plunger lift control apparatus