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 6240-01-422-6916
NSN 5975-01-140-6975
NSN 5910-00-472-8250
NSN 6135-01-386-1452
NSN 6105-01-228-8889
NSN 5996-01-370-9886
NSN 6685-01-246-8893
NSN 6685-01-496-3349
NSN 6620-00-905-6590
NSN 2925-01-540-7389
NSN 2925-01-551-5375
NSN 5855-01-236-9645