A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6650-00-952-4500
NSN 5910-01-648-2045
NSN 5895-01-013-0826
NSN 5835-01-596-9908
NSN 5915-01-381-5267
NSN 6220-01-634-0660
NSN 6685-00-390-3665
NSN 5925-00-111-1969
NSN 5990-01-188-7309
NSN 6145-00-454-0566
NSN 5998-01-502-9896
NSN 5996-00-272-2560