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 4140-01-484-9834
NSN 5895-01-431-7349
NSN 6135-01-275-1363
NSN 6220-00-233-7436
NSN 7035-01-334-5855
NSN 5935-00-992-2583
NSN 6130-01-367-7138
NSN 5935-01-343-0504
NSN 2925-00-253-1655
NSN 5998-01-468-3173
NSN 6220-01-459-4631
NSN 5950-01-415-3741