1. Ordnance provision system. Ordnance catalog (ordnance provision system): Groups A-T. A-48. Trainers, machine gun. addendum: May 13, 1943. Bookmark Corporate/Agency Authors: Ordnance Department, Army Services Forces, and War Department Publisher: Ordnance Department Date: [September 1943] SuDoc number: W 31.25:A-4s/3/add.