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 5996-01-167-0027
NSN 5950-00-686-2821
NSN 6610-00-960-9135
NSN 6240-01-193-1470
NSN 6610-01-597-8751
NSN 5935-01-220-3737
NSN 6150-00-131-8424
NSN 5996-00-932-2187
NSN 6150-01-535-7244
NSN 5975-01-109-8593
NSN 5930-00-016-8383
NSN 5935-01-153-7518