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 5920-01-088-0707
NSN 6105-00-489-6225
NSN 5999-01-559-6844
NSN 5925-00-459-5704
NSN 2925-01-380-0869
NSN 6110-01-220-9352
NSN 6240-01-349-8766
NSN 2925-01-156-9570
NSN 6685-01-128-5972
NSN 7035-01-554-9928
NSN 5965-01-202-1007
NSN 7035-00-206-6123