 NEW YORK, April 26, 2021 PRNewswire -- iQSTEL, Inc. USOTC: IQST today announced completing the onsite field test of its IoTSmartTank devices for its previously announced contract with a Fortune 500 Chemical Corporation. iQSTELs IoTSMartTank.com technology is based on iQSTELs proprietary and award-winning Smartgas intellectual property. 