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 5910-00-203-8284
NSN 5925-01-519-2575
NSN 5925-01-536-6647
NSN 5996-00-630-9594
NSN 6650-01-212-3964
NSN 6135-01-215-1245
NSN 5945-01-253-0357
NSN 6240-01-649-6937
NSN 6130-00-844-2792
NSN 5895-01-223-2405
NSN 5985-01-334-2588
NSN 6135-01-056-4609