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| All Patents in class 356/396 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,484,103 | Oct. 11, 1949 | R.E. Lewis | Projection Comparator for Objects in Relation to Spaced Drawings or Reticles | comparators | |
| 2,886,717 | May 12, 1959 | G.S. Walker, A.T. Sheperd, D.T. Williamson | Measuring Apparatus | measurement gauges | |