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| All Patents in class 428/15 | |||||
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| Number | Date | Patentee | Title | Type | |
| 126,042 | Apr. 23, 1872 | J.S. Elliott, J.F. Wood | Improvement in composition-stone frames for hot-air registers | ||
| 1,949,517 | Mar. 06, 1934 | E. Van der Pyl | Antislipping tread and method of making the same | ||