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| All Patents in class 267/174 | |||||
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| Number | Date | Patentee | Title | Type | |
| 292,169 | Jan. 22, 1884 | W.H. MacGregor | Pressure Gage | steam pressure gauges | |
| 894,782 | Jul. 28, 1908 | G.H. Rowe | Rock hammer-drill | handheld power hammers | |
| 2,915,076 | Dec. 01, 1959 | K.A. Teumer | Temperature compensating device | ||