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 5985-01-434-6889
NSN 6645-01-355-9733
NSN 5855-01-648-7687
NSN 5996-00-059-7061
NSN 6110-00-834-7801
NSN 2925-00-749-8893
NSN 5835-01-120-5079
NSN 7035-00-803-3056
NSN 6130-00-243-2208
NSN 2925-01-496-4699
NSN 6650-00-419-4863
NSN 6610-01-486-7954