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 7035-00-104-7613
NSN 5905-01-535-6792
NSN 5975-01-653-8139
NSN 5905-01-400-4154
NSN 5920-00-493-8307
NSN 4140-00-106-2659
NSN 6610-01-472-8724
NSN 6135-00-643-4843
NSN 6105-00-187-0094
NSN 5990-01-514-8708
NSN 5935-00-914-6959
NSN 5965-01-024-7960