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| All Patents in class 102/304 | |||||
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| Number | Date | Patentee | Title | Type | |
| 206,927 | Aug. 13, 1878 | O.F. Brockhausen | Improvement in Blasting Wedges | ||
| 315,006 | Apr. 07, 1885 | C.R. Countryman | Wedge | wood splitting machines | |