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 5965-01-068-2714
NSN 6685-00-408-3558
NSN 5895-00-732-2433
NSN 6130-01-549-7521
NSN 5915-01-633-9845
NSN 5920-01-245-2400
NSN 5920-01-421-5362
NSN 6240-01-455-5638
NSN 6685-01-113-3388
NSN 6105-01-258-5884
NSN 6645-01-557-8134
NSN 5945-01-545-4622