Number | Name | Date | Kind |
---|---|---|---|
714775 | Brown | Dec 1902 | |
3055209 | Reid et al. | Nov 1959 | |
3223194 | Michael | Dec 1965 | |
3264864 | Reid et al. | Aug 1966 | |
3500676 | Palmer | Mar 1970 | |
3592967 | Harris | Jul 1971 | |
3955404 | Bickel et al. | May 1976 |
Entry |
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J. R. Sabo, Detect Buried Steam Leak with Acoustics, Jul. 1976. |