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NO PURCHASE NECESSARY. Koch Employee Incentive Sweepstakes is open to legal residents of the 50 U.S., and DC, 18 yrs. and older that are full time Koch employees. Void where prohibited. Sweepstakes begins 11/1/19 at 12:00AM ET and ends 12/2/19 at 11:59PM PM ET. Official Rules. Sponsored by Koch Disruptive Technologies, LLC.