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 5920-00-846-6632
NSN 6320-01-299-6367
NSN 5965-01-231-9125
NSN 6240-01-388-7281
NSN 5915-01-222-3972
NSN 5960-01-333-1828
NSN 5895-01-058-2945
NSN 5950-00-249-3636
NSN 5990-01-140-5497
NSN 5999-01-591-6799
NSN 5990-01-346-8782
NSN 6685-01-312-6850