Exhibit 10.57 SUPPLEMENTAL INDENTURE TO BE DELIVERED BY GUARANTORS SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of November 4, 2003, among L-3 Communications Aeromet, Inc., an Oregon corporation, AMI Instruments, Inc., an Oklahoma...Supplemental Indenture • November 12th, 2003 • L 3 Communications Corp • Radio & tv broadcasting & communications equipment • New York
