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 5996-01-587-6894
NSN 6150-00-337-1955
NSN 6320-01-039-5891
NSN 6645-01-031-6402
NSN 6610-01-441-5062
NSN 5950-00-577-6986
NSN 5925-00-147-9946
NSN 5930-01-486-5397
NSN 5998-00-683-1333
NSN 6220-00-187-0649
NSN 6145-01-491-4883
NSN 5999-00-553-9831