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 7035-01-182-1086
NSN 5965-01-612-8098
NSN 5930-01-154-6537
NSN 5960-01-604-1158
NSN 6620-01-368-2723
NSN 5975-01-390-4558
NSN 6145-00-763-6077
NSN 5915-01-135-0631
NSN 7035-00-938-1505
NSN 5855-00-832-9341
NSN 6220-01-166-2186
NSN 6110-01-039-7161