Seal for underground passage, and storage system embodying same
United States Patent 2855757
Inventors:
Meade, Leonard P.
Publication Date:
10/14/1958
Assignee:
PHILLIPS PETROLEUM CO
Other Classes:
73/40.50R, 299/19, 405/133, 405/144, 52/169.600
International Classes:
B65G5/00; E21F17/16; E21F17/00
US Patent References:
| 2459227 | Underground reservoir for the storage of liquefied gases | | | |
| 2659209 | Underground liquid storage facility and the method of selecting and preparing the same | | | |
| 2697539 | Box with handle cover fastening means | | | |