| All Patents in class 33/371 |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| 92,927 | Jul. 27, 1869 | A. Amory | Improvement in guide-attachments for boring-instruments | drill accessories |
| 297,719 | Apr. 29, 1884 | A. Root | Combined Level and Boring Guide | levels |
| 352,721 | Nov. 16, 1886 | J.A. Traut | Stanley No 44 Bit and Square Level | levels |
| 449,609 | Mar. 31, 1891 | H. Green | Spirit-Level | levels |
| 450,457 | Apr. 14, 1891 | H. Green | Spirit Level | levels |
| 697,335 | Apr. 08, 1902 | I.B. Hagan | Measuring Instrument | protractors |
| 867,556 | Oct. 01, 1907 | R. Campbell | Combination Tool | try squares |
| 948,777 | Feb. 08, 1910 | U. Tuomi | Combined Square, Level, and Plumb | combination tools |
| 1,229,356 | Jun. 12, 1917 | O.C. Watkins | Weather-Boarding Gage | clapboard markers |
| 1,308,699 | Jul. 01, 1919 | W.L. Cusick | Combined Level, Plumb, and Gage | levels |
| 1,492,705 | May 06, 1924 | J. Dulczewski | Adjustable square attachment for handsaws | handsaws |
| 1,497,136 | Jun. 10, 1924 | J. Douma, W. Douma | Saw Gauge | saw gauges |
| 1,576,260 | Mar. 09, 1926 | H.F. Waite | Dental Level | levels |
| 2,824,381 | Feb. 25, 1958 | R.J. Traupmann | Pre-Indicator of Pipe Positions and Bends | pipe and tube benders |
