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 2925-01-573-1067
NSN 2925-00-054-3550
NSN 6685-01-446-8855
NSN 6220-00-672-4189
NSN 5835-01-286-6499
NSN 6320-01-631-7828
NSN 5915-00-286-3272
NSN 4140-01-559-9120
NSN 4140-01-052-9892
NSN 5905-01-300-7698
NSN 5930-01-381-8458
NSN 6135-01-084-1609