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 5996-01-154-3749
NSN 5920-01-141-6885
NSN 5985-01-437-7305
NSN 6240-00-770-3372
NSN 6620-00-940-8242
NSN 5855-01-583-6497
NSN 5835-01-580-0446
NSN 5990-00-242-3754
NSN 6645-01-265-0648
NSN 6145-01-495-0942
NSN 5998-00-159-1288
NSN 5985-01-321-4403