Stress relief annealed
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 5905-01-564-1043
NSN 6645-01-425-2330
NSN 4140-01-011-5356
NSN 5925-00-153-4518
NSN 5920-01-141-6885
NSN 5996-01-149-5506
NSN 6685-01-378-7090
NSN 5998-00-488-3705
NSN 5920-01-044-9021
NSN 5915-01-617-1005
NSN 5990-01-416-0362
NSN 6240-01-606-8924