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 5996-01-334-3038
NSN 5855-01-540-1185
NSN 5895-01-632-9997
NSN 5925-01-263-0857
NSN 5920-01-511-6441
NSN 6650-01-327-3068
NSN 5990-01-147-5225
NSN 6220-00-291-3722
NSN 4140-00-299-0595
NSN 6150-00-728-9764
NSN 5985-00-081-3456
NSN 6130-01-089-8154