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 5905-01-420-4172
NSN 6105-00-183-9019
NSN 2925-01-519-3221
NSN 6220-01-525-5956
NSN 5835-00-540-9669
NSN 5895-00-887-0552
NSN 5920-01-191-9847
NSN 6150-01-010-4155
NSN 6320-01-616-0843
NSN 6620-01-136-4473
NSN 6620-01-506-1003
NSN 7035-00-763-6180