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 6645-01-627-6161
NSN 5905-01-425-8740
NSN 5905-01-047-2258
NSN 5930-01-204-8350
NSN 6650-00-378-9416
NSN 5920-00-478-1280
NSN 5930-01-164-3333
NSN 5930-01-421-2417
NSN 6645-01-160-7707
NSN 5930-00-922-4919
NSN 5935-01-647-9296
NSN 5905-01-474-5856