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ZEN Graphene Solutions and Trebor RX Announce Successful Inhalation Safety Testing of ZENGuard(TM)-Enhanced Surgical Masks and Final Submission to Health Canada

GUELPH, ON / ACCESSWIRE / June 4, 2021 / ZEN Graphene Solutions Ltd. ("ZEN" or the "Company") (TSXV:ZEN)(OTC:ZENYF), a Canadian, next-gen nanomaterials technology company and Trebor Rx Corp. (Trebor) are pleased to announce successful inhalation safe