MS21961 (NOTICE 1), MILITARY STANDARD: PANEL RELAY, PILOT, ENCLOSED, AIRPORT LIGHTING (TYPES I AND II) (26 FEB 1988) [NO SUPERSEDING DOCUMENT]
MS21961 (NOTICE 1), MILITARY STANDARD: PANEL RELAY, PILOT, ENCLOSED, AIRPORT LIGHTING (TYPES I AND II) (26 FEB 1988) [NO SUPERSEDING DOCUMENT].