| All Patents in class 33/393 |
Patents 1 -
15
of 16
      |
| Number | Date | Patentee | Title | Type |
| 138,790 | May 13, 1873 | G.B. Cowles | Improvement in Plumb Bobs | plumb bobs |
| 151,521 | Jun. 02, 1874 | J.A. Traut | Improvement in Plumb Bobs | plumb bobs |
| 266,671 | Oct. 31, 1882 | W.L. Bergen | Plumb Bob | plumb bobs |
| 329,573 | Nov. 03, 1885 | A. Leidgen | Plumb Bob | plumb bobs |
| 433,842 | Aug. 05, 1890 | W.J. Workman | Builder's Plumb | plumb bobs |
| 461,757 | Oct. 20, 1891 | R.C. Huxtable | Chalk Line Holder and Plummet | |
| 584,803 | Jun. 22, 1897 | S.W. Wilcox | Plumb Bob | plumb bobs |
| 632,286 | Sep. 05, 1899 | A.A. Snebold | Plumb Bob | plumb bobs |
| 642,888 | Feb. 06, 1900 | A. Van Vliet | Combination Tool | carpenter squares |
| 645,263 | Mar. 13, 1900 | W.L. Keuffel | Tape reel | tape measures |
| 833,699 | Oct. 16, 1906 | L.S. Starrett | Plumb Bob | plumb bobs |
| 909,846 | Jan. 12, 1909 | W.N. Cavileer | Plumb Bob and Chalk Line Holder | plumbs |
| 932,218 | Aug. 24, 1909 | A. Wilson | Reel | plumb bobs |
| 1,876,473 | Sep. 06, 1932 | M.A. Gibson, F.C. Spaeth | Plumb Bob and Chalk Line | plumb bobs |
| 2,589,500 | Mar. 18, 1952 | J.R. Thomson, R.K. Landon | Strait-Line | plumb bobs |
