1. Ordnance provision system. Ordnance catalog (ordnance provision system): sec. 22, Mount, combination gun, T55, major items and maintenance parts required for maintenance of mount, combination gun, T55, addendum; Dec. 13, 1942. Bookmark Corporate/Agency Authors: Ordnance Department and Services of Supply Publisher: Ordnance Department Date: 1942 SuDoc number: W 31.23:A-55/sec.22/add.