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 7035-01-418-5499
NSN 6240-01-412-0715
NSN 5855-01-467-0128
NSN 5835-01-376-5233
NSN 5915-01-650-1733
NSN 6135-00-840-6451
NSN 5855-00-100-9003
NSN 5985-00-769-2735
NSN 5920-00-263-2192
NSN 2925-01-596-9448
NSN 6150-01-280-4552
NSN 6240-00-870-0423