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 5965-01-151-0903
NSN 6110-01-188-3867
NSN 6135-00-932-3136
NSN 6645-01-255-6324
NSN 5945-01-351-1871
NSN 5910-01-054-7381
NSN 5935-00-110-9465
NSN 6220-00-409-2120
NSN 5905-01-393-0347
NSN 5930-01-346-9692
NSN 6610-00-021-2259
NSN 6105-01-081-8702