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 6220-01-131-8827
NSN 6150-01-591-5018
NSN 5999-01-370-2840
NSN 5996-01-431-7013
NSN 6150-01-138-6210
NSN 5930-00-381-5567
NSN 5930-01-196-6137
NSN 6610-01-329-8017
NSN 2925-01-430-4206
NSN 5920-01-563-7675
NSN 7035-00-349-8571
NSN 6130-01-143-5952