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 6645-00-050-3738
NSN 6150-01-392-6189
NSN 5950-01-634-0677
NSN 6110-01-265-1080
NSN 6240-01-461-5966
NSN 6220-01-384-4609
NSN 6130-00-862-5516
NSN 5965-00-471-5018
NSN 5985-01-410-7826
NSN 6620-01-577-6285
NSN 2925-00-555-8836
NSN 6110-01-521-6796