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 5945-01-417-3059
NSN 5950-01-543-1262
NSN 6645-00-775-2172
NSN 6650-00-136-6003
NSN 4140-01-269-8378
NSN 5930-01-097-2302
NSN 5975-01-080-1259
NSN 6240-01-504-4287
NSN 5999-01-069-4879
NSN 5920-01-531-5719
NSN 6620-01-241-4881
NSN 5985-00-883-2556