Number | Name | Date | Kind |
---|---|---|---|
3078883 | Beall, Jr. | Feb 1963 | |
3207190 | Silbereis et al. | Sep 1965 | |
3289712 | Smith | Dec 1966 | |
4667710 | Wu | May 1987 | |
4834151 | Law | May 1989 | |
5125440 | Mette | Jun 1992 |
Entry |
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"Safe Fill No Spill", Specter, Toronto, Canada (no date). |
"Wonder-Fil". Arnold Industries, Toledo, Ohio (1984). |