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| All Patents in class 29/557 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 349,963 | Sep. 28, 1886 | A. Willcox, J.D. Watson | Apparatus for Boring Cylinders | ||
| 779,516 | Jan. 10, 1905 | J. Armstrong | Process of Cuttting Self Hardening Steel | ||
 | 2,259,472 | Oct. 21, 1941 | C. Johnson | Duplicator for machine tools | |
| 3,052,013 | Sep. 04, 1962 | W.B. Kane | Valve and Method of Manufacture | ||