Number | Name | Date | Kind |
---|---|---|---|
2969018 | Erst et al. | Jan 1961 | |
3016464 | Bailey | Jan 1962 | |
3180205 | Heppe et al. | Apr 1965 | |
3571796 | Brugger | Mar 1971 | |
3657547 | Mansfield | Apr 1972 | |
3997795 | Pohl | Dec 1976 | |
4053234 | McFarlane | Oct 1977 |
Entry |
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Smith et al. "Optical Alignment Apparatus," IBM Tech. Disclosure Bull., vol. 18, #2, 775, pp. 499-500. |