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 7035-00-834-2090
NSN 6645-01-495-0939
NSN 2925-01-295-2017
NSN 6220-00-080-2352
NSN 7035-01-351-4111
NSN 5950-01-573-0109
NSN 6610-00-056-5889
NSN 6110-01-502-5617
NSN 6105-00-788-1185
NSN 5920-01-445-4767
NSN 5895-01-224-9817
NSN 6320-01-158-2177