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 5915-01-263-1880
NSN 5915-01-292-0327
NSN 5835-01-507-0731
NSN 5998-01-651-4618
NSN 6135-01-466-3980
NSN 5930-01-199-2920
NSN 5960-00-874-0507
NSN 5945-00-003-5722
NSN 5999-00-597-5054
NSN 6610-00-170-6715
NSN 5925-01-026-5845
NSN 5915-01-492-9691