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| All Patents in class 474/137 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 629,899 | Aug. 01, 1899 | J.H. Flynn | Guide-pulley | |
 | 945,326 | Jan. 04, 1910 | J.G. Hey | Belt-tightener | |
 | 962,690 | Jun. 28, 1910 | H. Allen | Driving mechanism for drill-spindles | |
| 979,918 | Dec. 27, 1910 | J.R. Vincer, J.S. Barnes | Gearing for Drilling Machines | ||
 | 1,075,280 | Oct. 07, 1913 | H. Allen | Gearing | |
 | 1,560,193 | Nov. 03, 1925 | W.G. Allen | Drilling machines | |
 | 2,532,500 | Dec. 05, 1950 | L.D. Jansen | Belt grinder and polisher | |