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 5985-01-170-3500
NSN 5915-01-202-7737
NSN 4140-00-053-8358
NSN 5910-01-148-9191
NSN 5999-00-020-9015
NSN 5935-01-122-6711
NSN 5930-00-021-6906
NSN 5965-01-424-1096
NSN 5835-00-228-9082
NSN 5930-01-323-5331
NSN 5925-01-215-1386
NSN 5835-01-493-1826