William M. Spira

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Burnsville, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Apparatus for the continuous cultivation of aquatic macrophytes
- Patent number 5,636,472
- Issue date Jun 10, 1997
- William M. Spira
- A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING