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| All Patents in class 137/340 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,630,799 | May 31, 1927 | D.G. Murray | Compressor | air compressors | |
| 2,224,377 | Dec. 10, 1940 | G.H. Clark | Refrigerating Apparatus | refrigeration apparatus | |