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| All Patents in class 33/372 | |||||
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| Number | Date | Patentee | Title | Type | |
| 819,965 | May 08, 1906 | H.S. Williams | Leveling Instrument | levels | |
| 1,541,616 | Jun. 09, 1925 | B.C. Boggs | Bricklayer's Gauge | special purpose gauges | |