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 5910-01-572-4473
NSN 7035-01-550-9760
NSN 5855-01-133-3587
NSN 5945-01-089-7805
NSN 5985-01-627-3238
NSN 5975-00-425-4701
NSN 5895-01-421-2690
NSN 6130-01-050-4915
NSN 4140-01-377-5828
NSN 5960-00-539-6739
NSN 5915-01-107-7834
NSN 4140-01-077-3981