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 6105-01-315-8558
NSN 6685-00-149-1600
NSN 5930-01-202-0873
NSN 5855-00-149-0766
NSN 5965-01-576-5849
NSN 5835-00-847-7277
NSN 5935-00-217-2005
NSN 6610-01-392-4793
NSN 5910-01-584-4216
NSN 5835-01-657-0245
NSN 5930-01-339-2401
NSN 6240-01-104-4494