Wickman dial gauge for comparator use, made by Venner Time Switches, with adjustable upper and lower acceptable tolerance indication; 1939-1946. Wickman dial gauge for comparator use 1939-1946
4 Dial gauge for comparator use, made by Compar, with adjustable upper and lower acceptable tolerance indication; 1939-1946. 4 Dial gauge for comparator use 1939-1946
