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 6685-01-327-0489
NSN 6220-01-285-7080
NSN 5998-01-634-0604
NSN 5965-00-370-3855
NSN 6220-01-382-7740
NSN 2925-01-076-6128
NSN 5950-01-392-1895
NSN 5935-01-273-2823
NSN 5960-01-558-7787
NSN 6135-00-432-8779
NSN 5996-01-326-4115
NSN 5925-00-879-5108