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 4140-01-460-9575
NSN 5945-00-032-1308
NSN 5990-00-193-3028
NSN 6130-00-991-7249
NSN 5835-01-049-2965
NSN 5990-01-480-9938
NSN 5990-01-581-5103
NSN 5950-00-007-7432
NSN 5945-01-152-1368
NSN 5925-00-159-0444
NSN 5925-00-111-0452
NSN 5990-00-031-8598