| All Patents in class 33/371 |
Patents 1 -
10
of 14
      |
| Picture | Number | Date | Patentee | Title |
 | 92,927 | Jul. 27, 1869 | A. Amory | Improvement in guide-attachments for boring-instruments |
| | 297,719 | Apr. 29, 1884 | A. Root | Combined Level and Boring Guide |
 | 352,721 | Nov. 16, 1886 | J.A. Traut | Stanley No 44 Bit and Square Level |
 | 449,609 | Mar. 31, 1891 | H. Green | Spirit-Level |
 | 450,457 | Apr. 14, 1891 | H. Green | Spirit Level |
 | 697,335 | Apr. 08, 1902 | I.B. Hagan | Measuring Instrument |
 | 867,556 | Oct. 01, 1907 | R. Campbell | Combination Tool |
 | 948,777 | Feb. 08, 1910 | U. Tuomi | Combined Square, Level, and Plumb |
 | 1,229,356 | Jun. 12, 1917 | O.C. Watkins | Weather-Boarding Gage |
 | 1,308,699 | Jul. 01, 1919 | W.L. Cusick | Combined Level, Plumb, and Gage |
