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 7035-01-114-3134
NSN 5990-01-108-0436
NSN 5998-01-584-4394
NSN 2925-01-400-2286
NSN 6135-01-615-0812
NSN 6145-00-135-0045
NSN 5935-01-423-8564
NSN 5935-01-115-7768
NSN 5910-00-694-5361
NSN 5925-01-646-7103
NSN 5975-00-144-7878
NSN 5930-01-153-9374