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| All Patents in class 285/290.3 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | RE4,980 | Jul. 16, 1872 | M. Stephens | Improvement in joints for cement-pipes | |
 | 137,970 | Apr. 15, 1873 | M. Stephens | Improvement in cement-lined pipes | |
 | 158,539 | Jan. 05, 1875 | M. Stephens | Improvement in cement pipes | |