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 6220-01-634-0660
NSN 5915-01-466-4248
NSN 5985-01-239-2764
NSN 6130-01-159-4344
NSN 6610-01-464-9729
NSN 6110-00-081-0927
NSN 5975-00-465-9507
NSN 5915-01-536-1354
NSN 5999-00-246-4368
NSN 6105-00-974-8237
NSN 2925-00-828-5301
NSN 7035-01-083-0282