MS21961, MILITARY STANDARD: PANEL RELAY, PILOT, ENCLOSED, AIRPORT LIGHTING (TYPES I AND II) (09 AUG 1967) [NO SUPERSEDING DOCUMENT]
MS21961, MILITARY STANDARD: PANEL RELAY, PILOT, ENCLOSED, AIRPORT LIGHTING (TYPES I AND II) (09 AUG 1967) [NO SUPERSEDING DOCUMENT].