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 5975-00-470-2320
NSN 5855-01-464-3152
NSN 6610-00-194-0676
NSN 4140-01-414-4551
NSN 6135-01-463-2445
NSN 6150-01-185-5969
NSN 5985-01-426-8726
NSN 5855-01-085-5354
NSN 7035-00-445-9657
NSN 7035-01-058-5668
NSN 5910-00-907-8751
NSN 5985-01-073-9691