Stress relief annealed
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 6650-01-206-0037
NSN 6105-00-035-8809
NSN 6610-01-516-0749
NSN 6145-01-198-2479
NSN 5945-00-434-6786
NSN 5965-01-132-4018
NSN 5990-01-331-9438
NSN 5975-01-324-5256
NSN 5945-00-184-8721
NSN 6220-01-515-6886
NSN 5930-00-928-4066
NSN 5985-01-064-3698