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 5990-01-261-2962
NSN 6650-01-064-8941
NSN 6650-00-890-0480
NSN 6220-01-007-9988
NSN 5835-01-584-8538
NSN 5920-00-355-4735
NSN 5985-00-823-6302
NSN 6320-01-450-1696
NSN 5990-01-607-3528
NSN 6105-01-381-2012
NSN 6610-00-574-0156
NSN 6135-00-840-6451