Type bg261, instrument with button access
NSN 6130-00-842-7497
NSN 5950-01-558-2009
NSN 5990-00-104-4903
NSN 5960-00-475-4950
NSN 6135-00-593-6831
NSN 6650-01-271-4893
NSN 4140-01-608-3837
NSN 5996-00-238-5654
NSN 5920-01-481-7110
NSN 5930-00-256-3404
NSN 5915-01-202-3071
NSN 6685-01-364-2225