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| Patents for Theo. G. Koster | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 247,406 | Sep. 20, 1881 | N. Purdy | Pipe Tongs | |
 | 249,394 | Nov. 08, 1881 | I.B. Potts | Pipe Wrench | |
 | 284,521 | Sep. 04, 1883 | T.L. Whitacre | Wrench For Wagon Axle Nuts | |