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 6610-01-035-1252
NSN 7035-00-731-8729
NSN 5960-00-453-7846
NSN 6145-00-234-6337
NSN 6110-01-063-7423
NSN 6145-01-283-1262
NSN 6650-01-517-1094
NSN 6645-01-212-9474
NSN 7035-01-490-3832
NSN 6240-01-293-0584
NSN 5910-01-352-1053
NSN 5945-00-854-1234