Number | Name | Date | Kind |
---|---|---|---|
3159812 | Engel | Dec 1964 | |
3371165 | Earle et al. | Feb 1968 | |
3384873 | Sharma | May 1968 | |
3790723 | Stewart | Feb 1974 | |
3814839 | Lubarsky et al. | Jun 1974 | |
3843848 | Cox | Oct 1974 |
Entry |
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U.S. Published Patent Application, B 411,633, Bonser et al., 1-28-75. |