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 6610-01-127-0724
NSN 5950-01-467-8556
NSN 5985-00-295-3513
NSN 2925-01-354-1752
NSN 5895-01-274-5085
NSN 6685-01-100-1071
NSN 6320-01-412-2973
NSN 6320-01-371-1603
NSN 4140-00-181-3547
NSN 5998-01-369-7110
NSN 5935-01-519-5027
NSN 5930-01-602-3515