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 4140-01-495-0865
NSN 7035-00-059-7970
NSN 6610-01-069-7837
NSN 5960-01-543-0235
NSN 6645-01-309-6455
NSN 5945-01-261-1472
NSN 5895-01-003-8185
NSN 4140-01-513-9139
NSN 5835-01-632-6627
NSN 6150-01-442-8047
NSN 2925-01-575-7376
NSN 6620-01-643-5531