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 5935-00-499-9070
NSN 6240-01-250-3574
NSN 6110-01-623-1391
NSN 6110-00-423-5836
NSN 5925-01-237-2501
NSN 6130-01-110-0325
NSN 4140-00-064-7847
NSN 5999-00-925-2502
NSN 6685-01-518-0959
NSN 5975-01-440-7901
NSN 5915-00-233-2569
NSN 6620-01-277-9325