N1OS Mark J Buliszak 92 Proctor Rd Chelmsford, MA 01824-4415 United States Operator Class EXTRA Previous Callsign Grant Date 06/14/2022 Expire Date 07/12/2032 Codes HVIE - Vanity code - Primary Station Preference List Ads from N1OS on QTH.com Classifieds View Now! Put this form on your page! Enter a Callsign:   Courtesy of