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 6135-00-416-2898
NSN 5945-00-156-7256
NSN 6105-01-382-9156
NSN 6220-00-142-5115
NSN 5975-01-533-2119
NSN 5915-01-144-7696
NSN 5925-01-461-3594
NSN 6135-01-010-0891
NSN 6110-01-571-7987
NSN 5835-01-093-9643
NSN 5855-00-832-9341
NSN 5965-00-554-4138