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 6650-01-172-9476
NSN 5925-01-209-9414
NSN 6110-01-573-8906
NSN 2925-01-418-3296
NSN 6650-00-251-2324
NSN 5950-01-399-2603
NSN 5960-01-563-6975
NSN 6130-00-161-2418
NSN 2925-00-442-6702
NSN 6645-00-402-5622
NSN 5990-00-770-6975
NSN 5945-01-472-2099