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 6620-00-707-4195
NSN 5999-00-432-0659
NSN 5915-00-025-1763
NSN 5975-01-478-1262
NSN 6610-00-977-1498
NSN 5945-01-299-5929
NSN 5996-01-520-5894
NSN 5999-01-634-0576
NSN 6110-01-345-6626
NSN 6105-01-525-8860
NSN 6135-00-982-1882
NSN 5895-01-324-4460