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 6610-01-603-0703
NSN 6645-00-456-7653
NSN 5855-01-255-1688
NSN 5945-01-510-6901
NSN 6620-01-187-7267
NSN 6620-00-816-9755
NSN 6105-01-643-1465
NSN 6685-01-643-2827
NSN 5950-00-840-5677
NSN 6645-01-360-4562
NSN 5990-00-694-4086
NSN 6135-01-119-0720