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 7035-01-491-3981
NSN 5895-01-613-2956
NSN 6145-01-013-4068
NSN 6320-01-441-2438
NSN 5910-01-655-7712
NSN 5996-01-065-6664
NSN 5998-00-500-3477
NSN 6610-01-187-9384
NSN 6650-01-504-1798
NSN 5895-00-332-5025
NSN 5950-01-300-6813
NSN 5920-00-864-4588