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 5910-01-205-5007
NSN 5855-01-581-5827
NSN 6220-01-104-3006
NSN 5935-01-455-7943
NSN 5835-00-289-9080
NSN 5960-01-377-1907
NSN 5990-01-400-3299
NSN 6130-00-865-6558
NSN 5935-01-295-5003
NSN 6685-00-978-2853
NSN 5925-01-185-9897
NSN 5996-00-237-5146