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<http://webisa.webdatacommons.org/304059323>	<http://www.w3.org/ns/prov#value>	"The demonstration at the Amos Farm in Williamsburg was part of the Michigan Propane Gas Association (MPGA) annual summer conference. ???Field demonstrations allow growers to see the Stinger in person, and this test in particular was an opportunity to demonstrate the effectiveness of this propane-powered technology to dealers across Michigan,??? Kobbins said. ???Our goal with field demonstrations i" .