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 4140-01-323-3983
NSN 5998-01-173-1933
NSN 5975-01-294-5302
NSN 5910-00-996-3758
NSN 5905-01-508-4193
NSN 5855-00-138-2386
NSN 5935-00-804-8157
NSN 5990-00-263-1289
NSN 6645-01-560-3034
NSN 6610-01-097-5073
NSN 6145-01-487-0792
NSN 6220-00-804-9270