WB6MZS MICHAEL M SINKEWITSCH, JR 7 Light Way Menlo Park, CA 94025 United States Operator Class GENERAL Previous Callsign Grant Date 03/10/2023 Expire Date 10/23/2028 Codes HAI - Ham Radio - Individual Ads from WB6MZS on QTH.com Classifieds View Now! Put this form on your page! Enter a Callsign:   Courtesy of