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 6320-00-937-5625
NSN 6620-01-272-7831
NSN 6685-01-441-3901
NSN 4140-01-480-3814
NSN 6610-01-180-2184
NSN 5950-00-478-2413
NSN 5960-01-283-3467
NSN 5835-00-195-7508
NSN 5996-00-104-5607
NSN 5895-01-413-8682
NSN 6145-00-836-0510
NSN 5895-01-199-5599