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 5985-00-009-8097
NSN 5998-01-157-7037
NSN 5998-00-198-2854
NSN 5895-00-275-1689
NSN 5915-00-916-8017
NSN 5990-00-345-8967
NSN 4140-01-593-0139
NSN 6645-01-153-7666
NSN 5998-01-056-4598
NSN 5935-01-617-2011
NSN 6650-01-204-2524
NSN 5855-01-649-3606