Apparatus for heating oil wells
United States Patent 1681523

Inventors:
Downey, Patrick V.
Wendroff, Clifford H.
Publication Date:
08/21/1928
View Patent Images:
Download PDF 1681523 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
Downey, Patrick V.
Wendroff, Clifford H.
Primary Class:
392/302
Other Classes:
392/492
International Classes:
E21B36/04; E21B36/00