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 5930-00-932-4244
NSN 5925-00-181-4158
NSN 5930-01-508-0421
NSN 5965-00-285-0745
NSN 5998-01-651-6676
NSN 5960-01-156-7469
NSN 6610-00-786-9749
NSN 6610-01-352-5500
NSN 6150-00-260-7817
NSN 5950-01-365-8040
NSN 6650-01-388-2538
NSN 5835-00-761-5615