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 5950-01-010-4417
NSN 5835-01-094-2662
NSN 5975-01-130-8501
NSN 6220-00-111-3497
NSN 5925-00-473-2622
NSN 2925-00-580-4931
NSN 5920-01-249-1903
NSN 5975-01-394-5281
NSN 6620-01-604-4072
NSN 6150-00-924-2271
NSN 5835-00-407-6820
NSN 6620-01-367-2597