US Patent: 3,460,263
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| Gauge and sliding supports therefor
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Patentee:
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| Erwin W. Graham (exact or similar names) - Willoughby, OH |
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Patent Dates:
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| Applied: |
Aug. 13, 1965 |
| Granted: |
Aug. 12, 1969 |
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Jeff Joslin
Vintage Machinery entry for PMC Industries Corp.
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Description: |
| This patent number has been seen on the "SquareMaster" from PMC, which is a vertical granite column mounted on a base that is typically used on a granite surface plate. It is flat and square to within 50 millions of an inch over 18 inches of vertical travel. |
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