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 5990-01-376-8930
NSN 5835-01-538-8080
NSN 6645-01-089-6459
NSN 6220-01-432-2232
NSN 6610-01-166-3125
NSN 6610-00-516-4228
NSN 5996-01-407-7374
NSN 5915-01-279-3775
NSN 5985-01-545-5885
NSN 5920-00-215-0076
NSN 5945-00-678-2859
NSN 5999-01-446-4924