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 5835-00-835-7838
NSN 5915-00-683-8248
NSN 6650-01-008-6080
NSN 6240-01-623-8783
NSN 5855-01-473-6076
NSN 5910-01-334-9759
NSN 5985-01-599-1818
NSN 6105-00-437-7834
NSN 5945-01-223-5753
NSN 5990-01-056-6413
NSN 5910-00-057-8816
NSN 5990-01-181-9886