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 5975-01-374-8597
NSN 5945-00-803-4585
NSN 6240-01-252-4219
NSN 5990-01-517-1909
NSN 5930-00-082-7244
NSN 5960-00-108-0252
NSN 6220-00-258-2967
NSN 5990-01-084-0807
NSN 6145-01-322-6943
NSN 5965-01-408-8066
NSN 5920-01-158-9125
NSN 5996-00-857-9810