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 6145-01-492-1061
NSN 6320-01-050-1290
NSN 6645-01-493-2620
NSN 5960-01-086-0830
NSN 6135-00-299-6918
NSN 6620-01-580-2112
NSN 4140-01-252-8902
NSN 6620-00-498-4190
NSN 5950-00-905-6257
NSN 6130-01-161-8635
NSN 6130-00-410-8496
NSN 6145-01-195-8824