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OTC Markets Group Welcomes Rock Tech Lithium Inc. to OTCQX

NEW YORK, May 5, 2021 /PRNewswire/ -- OTC Markets Group Inc. (OTCQX:OTCM), operator of financial markets for 11,000 U.S. and global securities, today announced Rock Tech Lithium Inc. (TSXV:RCK) (OTCQX:RCKTF), a lithium development and chemical technol