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 5996-00-636-4849
NSN 5960-01-037-4809
NSN 5996-00-127-8824
NSN 6145-00-635-9957
NSN 6130-01-535-0952
NSN 5945-00-529-0409
NSN 2925-00-026-0005
NSN 6135-00-583-3966
NSN 5910-01-646-8050
NSN 6620-00-366-1365
NSN 5915-01-157-6207
NSN 5960-01-470-1579