| Patents for Henry Bolthoff |
Patents 1 -
10
of 17
      |
| Picture | Number | Date | Patentee | Title |
 | 121,985 | Dec. 19, 1871 | H. Bolthoff | Improvement in stamp-guides |
 | 166,743 | Aug. 17, 1875 | H. Bolthoff | Improvement in wet and dry ore crushers |
 | 204,945 | Jun. 18, 1878 | H. Bolthoff | Improvement in pulverizing apparatus |
 | 260,527 | Jul. 04, 1882 | H. Bolthoff | Cam-shaft box for stamp-mills |
 | 261,297 | Jul. 18, 1882 | H. Bolthoff | Mortar for stamp-mills |
| | 312,956 | Feb. 24, 1885 | H. Bolthoff | Stamp-mill |
 | 451,720 | May 05, 1891 | H. Bolthoff | Steam-engine |
 | 494,518 | Mar. 28, 1893 | H. Bolthoff | Brake mechanism |
 | 515,896 | Mar. 06, 1894 | H. Bolthoff | Mortar for stamp-mills |
 | 526,007 | Sep. 11, 1894 | H. Bolthoff | Hoisting-drum |
