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| All Patents in class 34/237 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 43,530 | Jul. 12, 1864 | J.P. Stillman | Improvement in machines for drying wool | |
 | 3,159,469 | Dec. 01, 1964 | R.J. Rahn, I.J. Rahn | Gradient temperature normalizer for surface plates or blocks | |