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 6320-01-476-7476
NSN 6150-00-201-5834
NSN 5920-01-147-9686
NSN 5999-01-327-4252
NSN 6130-01-417-2662
NSN 5975-00-865-3537
NSN 6240-01-221-9093
NSN 5910-01-304-5783
NSN 5999-00-763-0677
NSN 6110-01-398-6928
NSN 6220-00-944-4512
NSN 5915-01-482-5502