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| All Patents in class 356/141.3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,692,527 | Oct. 26, 1954 | E.J. Wutschel, T.A. Wetzel | Optical Aligning Apparatus for Machine Tools | metalworking machine mechanisms | |
| 2,703,505 | Mar. 08, 1955 | J.A. Senn | Apparatus for Aligning Machine Elements | milling machine accessories | |
| 3,348,057 | Oct. 17, 1967 | R.K. Burroughs | Method and Apparatus for Checking the Straightness of Machine Tool Ways and the Like | metalworking machine mechanisms | |