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 6150-01-428-5825
NSN 5960-01-328-8248
NSN 5915-00-232-7315
NSN 6220-01-185-1136
NSN 6610-01-642-1752
NSN 2925-01-105-7850
NSN 5930-00-230-4980
NSN 5985-00-873-9294
NSN 6110-00-271-9928
NSN 2925-01-513-4457
NSN 5985-00-501-5249
NSN 4140-01-612-9798