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 5990-00-840-6571
NSN 6220-00-148-6987
NSN 6240-01-419-5260
NSN 6145-01-634-0388
NSN 5965-01-147-5847
NSN 5835-01-030-2519
NSN 5985-00-471-9703
NSN 5905-00-584-5009
NSN 6135-01-396-4900
NSN 5990-01-333-6583
NSN 6620-01-649-6050
NSN 5855-00-198-3197