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| Patents for William Houghtaling | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 434,930 | Aug. 26, 1890 | W. Houghtaling | Lathe | |
| 494,482 | Mar. 28, 1893 | W. Houghtaling | Attachment for Steam Indicators | ||
| 533,812 | Feb. 05, 1895 | W. Houghtaling | Steam Engine Indicator | ||
| 538,042 | Apr. 23, 1895 | W. Houghtaling | Steam Engine Indicator | ||
| 538,043 | Apr. 23, 1895 | W. Houghtaling | Steam Engine Indicator | ||
| 646,700 | Apr. 03, 1900 | W. Houghtaling | Steam Engine Indicator | ||