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Curiosity only question, of no useful value, but when did the patent expire? https://patents.google.com/patent/US5120006A/en?inventor=hadzicki seemed to expire in 2009 but Hadzicki-wing like kites didn't really seem to appear under other "brands" until 2015 or later? Was this because of the "master builders" Rev used or the in-house Barresi's, etc., which went away eventually?1 point