FIRST SUPPLEMENTAL INDENTURE FIRST SUPPLEMENTAL INDENTURE dated as of May 31, 2000, between MGC COMMUNICATIONS, INC., a corporation duly organized and existing under the laws of Nevada (hereinafter called the "Company"), and HSBC Bank USA (successor...Supplemental Indenture • June 2nd, 2000 • MGC Communications Inc • Telephone communications (no radiotelephone) • New York
