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 5950-01-003-4205
NSN 5910-01-501-9988
NSN 5999-01-256-5738
NSN 6150-01-129-3951
NSN 5925-01-279-1689
NSN 6650-01-065-4748
NSN 5905-00-758-7091
NSN 6320-00-331-7138
NSN 5985-01-026-1002
NSN 5895-00-156-7282
NSN 5990-01-430-9177
NSN 5985-00-562-4310