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 6145-00-959-7610
NSN 5990-01-652-7373
NSN 5990-01-364-0813
NSN 5990-01-071-8510
NSN 6240-00-843-0698
NSN 5945-00-751-8956
NSN 6620-01-105-5770
NSN 5855-00-586-6255
NSN 5935-01-541-5104
NSN 7035-01-537-9439
NSN 5905-01-422-1670
NSN 5990-01-591-8797