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 5960-01-516-7264
NSN 6320-00-186-6452
NSN 5945-00-777-6891
NSN
NSN 2925-00-915-1827
NSN 5990-01-149-9228
NSN 4140-00-652-4547
NSN 4140-00-816-8820
NSN 6105-01-207-8332
NSN 6220-01-025-6140
NSN 5835-01-574-9268
NSN 5935-00-816-9923