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 6620-01-327-3011
NSN 5975-01-105-9020
NSN 5999-01-113-2483
NSN 5930-01-437-5670
NSN 5915-01-606-4386
NSN 6105-01-234-1038
NSN 5999-00-212-7853
NSN 5910-00-632-8117
NSN 6610-01-310-3313
NSN 4140-01-025-1555
NSN 4140-01-152-9161
NSN 5895-01-474-9377