 Plymouth, Massachusetts--Newsfile Corp. - September 2, 2021 - Plymouth Rock Technologies Inc. CSE: PRT OTCQB: PLRTF FSE: 4XA WKN A2N8RH Plymouth Rock, PRT, or the Company, a leader in developing detection apparatus and unmanned technologies, is pleased to announce the sale of custom drones to Survey-AR to deliver a drone swarm test capability. The project will assess an autonomous drone swarm system to optimize weather and air quality monitoring in atmospheric boundary layer environments with... 