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 5920-01-442-7685
NSN 6240-00-975-0868
NSN 5965-00-560-1760
NSN 5835-00-087-9512
NSN 5998-01-362-1909
NSN 5996-01-394-5768
NSN 5985-00-491-0654
NSN 4140-01-273-7788
NSN 5930-00-067-4468
NSN 5975-01-383-4766
NSN 6135-01-010-0891
NSN 6130-01-446-4132