5930-01-101-9953 (3D9-000010-01)
NSN 5930-01-101-9953 (NIIN 01-101-9953) is a dual test switch as in Federal Supply Class 5930, Switches. Manufacturer part number 3D9-000010-01 (Aiken Advanced Systems IncA Div Of, CAGE 60590); also referenced as 52-3091-401-00LV (Hensoldt Sensors Gmbh).
NIIN assigned October 1980; DEMIL A (none required).