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 6645-01-571-8578
NSN 6620-00-105-3312
NSN 5910-01-648-2045
NSN 4140-01-418-1894
NSN 5915-00-812-2044
NSN 6610-01-135-2149
NSN 5945-00-825-8312
NSN 6645-00-192-1152
NSN 5945-01-369-2733
NSN 6105-01-499-7156
NSN 5998-01-499-9830
NSN 6620-01-088-1272