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 6610-00-671-6019
NSN 6150-01-226-7089
NSN 5915-01-519-6675
NSN 5965-00-253-1302
NSN 5998-01-074-9105
NSN 6610-01-289-5784
NSN 5965-01-274-6488
NSN 6130-01-207-0755
NSN 6130-01-085-8014
NSN 6610-01-381-0652
NSN 5855-01-125-4768
NSN 6650-00-883-4790