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 5895-01-463-0781
NSN 5895-00-878-7768
NSN 6650-01-633-9147
NSN 6145-01-050-1187
NSN 5998-01-391-6065
NSN 4140-01-230-3276
NSN 6220-01-467-4782
NSN 6105-00-541-8472
NSN 5945-01-140-4330
NSN 5996-01-125-5781
NSN 5965-01-590-5485
NSN 5975-01-383-6548