I googled the patent number and found the following info. The figures on the patent sketches looks slightly different than the piece. Patent number: US 3497806
This unit was tested and works great. Comes with standard North American 120V power supply. Overview The Alpha 4160C LED Electronic Sign is a state-of-the-art indoor, full matrix, tricolor LED display.
Like new 15000KW North Star generator. Perfect as a portable power source or as a back-up, standby power source for a house or a building. Used less than 50 hours!
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