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 5925-00-930-2265
NSN 5998-01-560-9432
NSN 6150-00-456-0775
NSN 6620-01-613-7996
NSN 5915-01-229-7642
NSN 6650-00-134-5130
NSN 6220-01-090-0126
NSN 6220-01-290-4739
NSN 6685-00-152-3982
NSN 5925-01-370-0955
NSN 5905-01-565-4573
NSN 7035-01-647-8664