Number | Name | Date | Kind |
---|---|---|---|
2171942 | Mueller | Sep 1939 | |
2237476 | Cline | Apr 1941 | |
2510513 | Meuller | Jun 1950 | |
2756486 | Smith | Jul 1956 | |
3374521 | Clarke | Mar 1968 | |
3756267 | Hutton | Sep 1973 | |
3773067 | Ray | Nov 1973 | |
3799182 | Long | Mar 1974 | |
4127141 | Ledonne et al. | Nov 1978 | |
4184504 | Carmichael et al. | Jan 1980 | |
4883085 | Weller et al. | Nov 1989 |
Entry |
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Advertisement of T. D. Williamson, Inc. from 3/90 issue of Pipeline & Gas Journal, "Circle 113". |
Flier (not dated) put out by T. D. Williamson, Inc. re Polystopp plugging system. |