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 5990-00-683-1095
NSN 6645-00-033-8714
NSN 7035-01-143-0355
NSN 5935-01-510-9714
NSN 5996-01-599-5712
NSN 6135-00-221-4720
NSN 5855-01-441-1392
NSN 5999-01-242-5049
NSN 5905-00-147-3208
NSN 5855-01-109-6433
NSN 5855-01-027-1571
NSN 5996-01-281-7336