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| Patents for Robert R. Ketchel | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 990,421 | Apr. 25, 1911 | G.H. Benzon, Jr. | Belt Driving Mechanism for Reciprocating Parts of Machines | |
 | 1,380,699 | Jun. 07, 1921 | G.H. Benzon, Jr. | Planer | |
 | 1,455,556 | May 15, 1923 | W.H. Thorne | Clamping Mechanism for Machine Tools | |