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 6650-00-695-0304
NSN 6150-01-287-9643
NSN 5855-00-300-1873
NSN 6620-01-504-5756
NSN 5905-00-295-4442
NSN 5910-01-239-0109
NSN 5945-00-181-9558
NSN 4140-01-068-3500
NSN 5990-00-723-2482
NSN 5950-01-241-5477
NSN 6610-01-545-0766
NSN 6645-00-467-6094