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 6150-01-143-1085
NSN 6650-01-599-9849
NSN 5905-01-377-2638
NSN 6135-01-441-7922
NSN 4140-01-177-6292
NSN 5930-00-806-4993
NSN 6150-01-648-6963
NSN 7035-01-026-0117
NSN 4140-00-121-6746
NSN 6610-00-891-2272
NSN 5925-00-823-2909
NSN 5925-01-191-9854