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| All Patents in class 137/505.44 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,187,038 | Jan. 16, 1940 | I.J. Knudson | Method of and Apparatus for Cold Control | refrigeration apparatus | |
| 2,251,831 | Aug. 05, 1941 | I.J. Knudson | Refrigerating Apparatus | refrigeration apparatus | |