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 5855-01-580-0645
NSN 6645-01-530-9134
NSN 6150-01-647-3451
NSN 5965-01-379-6707
NSN 5990-00-277-3763
NSN 5950-01-579-9472
NSN 5950-01-175-1835
NSN 5835-01-459-8664
NSN 5960-00-829-6227
NSN 5945-01-336-1626
NSN 5895-01-004-9861
NSN 5910-00-904-1427