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 4140-01-125-5187
NSN 5910-00-439-6399
NSN 5920-01-358-2518
NSN 5950-01-125-6900
NSN 5998-00-843-1125
NSN 5835-00-339-3020
NSN 5910-00-707-3268
NSN 6110-01-553-8608
NSN 5915-00-543-1133
NSN 6150-01-559-6741
NSN 6130-00-294-5727
NSN 5965-01-056-7225