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| All Patents in class 356/400 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,694,804 | Nov. 16, 1954 | E.K. Wagner | Positioning Device | ||
| 2,703,505 | Mar. 08, 1955 | J.A. Senn | Apparatus for Aligning Machine Elements | ||
| 3,348,057 | Oct. 17, 1967 | R.K. Burroughs | Method and Apparatus for Checking the Straightness of Machine Tool Ways and the Like | ||
| 4,197,888 | Apr. 15, 1980 | L.M. Yock, R.A. Browning, A.L. McGee | Log centering apparatus and method using transmitted light and reference edge log scanner | ||