 Plymouth, Massachusetts--Newsfile Corp. - September 9, 2021 - Plymouth Rock Technologies Inc. CSE: PRT OTCQB: PLRTF FSE: 4XA WKN A2N8RH Plymouth Rock, PRT, or the Company, a leader in developing threat detection and unmanned technologies, is pleased to announce that it has completed the qualification for ISO 9001: 2015, and has been accredited this under certificate 377662021. ISO 9001: 2015 Quality Management Standard QMS was developed by the International Organization for Standardization ISO and is... 