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 5895-01-162-9402
NSN 5950-00-130-6568
NSN 6240-01-653-3221
NSN 6650-01-415-1870
NSN 6110-00-699-1495
NSN 5855-00-861-0006
NSN 5998-01-475-1885
NSN 6320-01-300-7994
NSN 6240-01-430-4865
NSN 5950-01-350-9914
NSN 5920-01-634-0250
NSN 5985-00-244-0842