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| All Patents in class 33/339 | |||||
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| Number | Date | Patentee | Title | Type | |
| 323,826 | Aug. 04, 1885 | J. Madden, W.J. Osborn | Shaft Liner | special purpose gauges | |
| 467,016 | Jan. 12, 1892 | M.F. Oliver | Square for Leveling & Aligning Shafting | special purpose gauges | |
| 1,541,616 | Jun. 09, 1925 | B.C. Boggs | Bricklayer's Gauge | special purpose gauges | |