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 5920-00-125-7757
NSN 5965-01-277-8589
NSN 5910-01-154-8164
NSN 6105-01-337-5774
NSN 5920-01-288-4389
NSN 5990-01-606-9305
NSN 5950-00-140-9696
NSN 5998-01-236-0013
NSN 6150-00-773-5147
NSN 5998-01-611-0399
NSN 5945-00-352-5124
NSN 5895-00-996-8533