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| All Patents in class 156/257 | |||||
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| Number | Date | Patentee | Title | Type | |
| 161,746 | Apr. 06, 1875 | W.E. Brock | Improvement in lumber | ||
| 4,920,723 | May 01, 1990 | D.R. Porter | Hollow Granite Box Beam and Method of Forming | manufacturing processes | |