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| Patents for Lennart M. Hellstrom | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,809,515 | Oct. 15, 1957 | L.M. Hellstrom, D.E. Cardoze, L.A. Bard | Coolant Testing Instrument | coolant testing apparatus | |
| 3,242,955 | Mar. 29, 1966 | L.M. Hellstrom | Log Splitter | wood splitting machines | |