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 5990-00-234-9136
NSN 6645-01-499-7385
NSN 6650-00-489-9194
NSN 6130-01-224-7393
NSN 5960-01-144-5502
NSN 5975-01-513-9163
NSN 5985-00-811-1197
NSN 5855-00-472-2055
NSN 5999-00-176-2335
NSN 6150-01-023-7710
NSN 6110-01-623-4216
NSN 5945-00-412-2902