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 5945-01-372-5576
NSN 5895-01-357-9180
NSN 5935-00-276-9413
NSN 5960-00-728-3459
NSN 6150-01-499-4242
NSN 5998-00-078-5635
NSN 4140-00-200-0970
NSN 6240-00-909-3612
NSN 5996-00-576-6214
NSN 6320-00-313-9114
NSN 2925-01-541-5031
NSN 6135-01-448-9474