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 5835-01-250-2939
NSN 5975-01-264-8709
NSN 5950-01-152-1271
NSN 5925-01-332-8993
NSN 5905-01-009-5560
NSN 5935-01-634-0668
NSN 5935-01-546-6199
NSN 5999-01-056-5281
NSN 7035-01-444-4240
NSN 4140-01-451-9754
NSN 6150-01-529-5496
NSN 5998-01-196-6131