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| Patents for National Steam Gauge Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 16,428 | Jan. 20, 1857 | E.G. Allen | Steam-pressure gage | |
 | 18,526 | Oct. 27, 1857 | E.G. Allen | Steam-pressure gage | |
 | 23,032 | Feb. 22, 1859 | T.W. Lane | Steam-pressure gage | |
 | 26,152 | Nov. 22, 1859 | E.G. Allen | Combination steam-gage | |
 | 26,871 | Jan. 17, 1860 | E.G. Allen | Steam-gage | |
| GB-186,000,306 | Feb. 04, 1860 | A.V. Newton, E.G. Allen | An improved construction of combination steam gauge | ||
 | RE5,320 | Mar. 11, 1873 | T.W. Lane | Improvement in steam-gages | |