Means for maintaining perma-frost foundations
United States Patent 3217791

Inventors:
Long, Erwin L.
Publication Date:
11/16/1965
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Assignee:
Long, Erwin L.
Primary Class:
165/45
Other Classes:
165/104.210, 62/119, 166/901, 62/333
International Classes:
E02D3/115; E02D27/35; F25B23/00; F28D15/02; E02D3/00; E02D27/32
Foreign References:
FR475226A