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 6135-00-209-6918
NSN 5960-01-564-5044
NSN 4140-01-203-5128
NSN 6650-00-153-3155
NSN 5990-01-431-6749
NSN 5895-01-088-0129
NSN 5930-00-340-0597
NSN 6110-01-264-9933
NSN 5855-00-361-0167
NSN 2925-00-422-5159
NSN 5935-01-052-5223
NSN 5965-00-908-1402