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| Patents for H. F. Parker | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 326,561 | Sep. 22, 1885 | L.N. Hopkins, G.M. Hopkins | Gas Engine | |
 | 326,562 | Sep. 22, 1885 | L.N. Hopkins, G.M. Hopkins | Gas Engine | |
 | 539,155 | May 14, 1895 | J.J. Tower | Improvement in Screw - Drivers | |
 | 539,890 | May 28, 1895 | E.A. Cochran | Wrench | |