1. Joint-Army-Navy specification. JAN-R-20. Resistors, external meter (high voltage, ferrule terminal type), amdt. 4; May 8, 1950. Bookmark Corporate/Agency Authors: Supplies and Accounts Bureau (Navy) and Defense Dept. Publisher: Supplies and Accounts Bureau (Navy) Date: [1950.] SuDoc number: N 20.23:JAN-R-29/amdt.4