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 5835-00-227-7909
NSN 7035-00-541-8516
NSN 6645-01-479-5364
NSN 5975-00-393-1269
NSN 6685-00-248-6990
NSN 5975-01-167-1819
NSN 5960-00-762-9260
NSN 6610-01-468-0679
NSN 5895-01-367-2683
NSN 5915-01-230-6775
NSN 6320-01-310-8068
NSN 6320-01-609-9763