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 6135-01-277-7907
NSN 6130-01-554-1858
NSN 6645-00-312-2752
NSN 6130-01-109-5000
NSN 6130-01-361-5171
NSN 5915-01-533-1290
NSN 4140-01-290-5230
NSN 5930-00-145-4759
NSN 6650-01-564-3452
NSN 6150-01-306-0712
NSN 6620-01-179-7259
NSN 5935-01-377-0525