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 6320-01-631-7828
NSN 5905-01-441-1731
NSN 5935-01-564-0298
NSN 5965-01-204-8505
NSN 5999-01-353-5292
NSN 5975-01-116-2115
NSN 6130-00-335-9712
NSN 5950-01-524-6851
NSN 6150-00-473-6568
NSN 5999-01-515-1545
NSN 5895-01-461-2972
NSN 2925-01-113-6904