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HOLLY RAMERLISA RATHKE

In this photo taken Friday March 21, 2014, maple syrup producer Donnie Richards poses with sap lines on a maple tree and his wireless radio unit box containing sensors that monitor pressure on sap lines in Milton, Vt. Richards has about 5,000 taps, with about 18 miles of tubing spread out over more than 100 acres and uses the wireless sensors to monitor the flow of sap that provides information immediately on a smart phone of tablet computer. (AP Photo/Holly Ramer)
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Syrup-makers go high-tech with wireless monitoring

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