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 6320-00-731-6134
NSN 5835-00-683-4612
NSN 5855-01-138-4985
NSN 6220-01-083-6936
NSN 5945-01-408-4552
NSN 5895-01-650-5780
NSN 6150-01-429-7097
NSN 2925-01-499-8720
NSN 6130-01-527-6159
NSN 5950-01-237-6917
NSN 5915-00-866-6586
NSN 5990-01-421-5342