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 5855-01-067-4129
NSN 7035-01-056-1302
NSN 6110-01-481-1614
NSN 6135-00-985-7887
NSN 5930-01-310-7708
NSN 5915-01-559-6044
NSN 6150-00-179-1862
NSN 5910-00-336-9846
NSN 6145-01-141-7250
NSN 5985-01-481-3986
NSN 6650-00-378-9416
NSN 5905-01-452-0671