1. Army Ballistic Missile Agency research report. 1R16. Performance of copper-mandrel potentiometers in A-C operational amplifiers [with list of references]: by Hans H. Hasenthien. Bookmark Corporate/Agency Authors: Ordnance Corps (Army) and Defense Dept. Publisher: Ordnance Corps (Army) Date: Sept. 15, 1956 SuDoc number: D 105.15:1R16