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 2925-01-463-3899
NSN 5930-00-038-1853
NSN 5910-00-263-3630
NSN 5960-01-183-8213
NSN 5855-01-398-0090
NSN 5945-00-566-3013
NSN 5998-00-800-6769
NSN 2925-01-472-4423
NSN 5990-01-361-6424
NSN 6150-00-221-5122
NSN 5835-01-449-7511
NSN 5920-01-412-2540