Assertion: hang glider's motor | /r/HasProperty | powered by storage batteries
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Source sentences:
text: 1979 April 29: at Flabob Airport, California, Larry Mauro flew the Solar Riser with an electric motor powered by storage batteries charged from the sun.
text: 1979 April 29: at Flabob Airport, California, Larry Mauro flew the Solar Riser with an electric motor powered by storage batteries charged from the sun.