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 5910-01-198-5433
NSN 5998-00-107-5000
NSN 6620-01-106-3553
NSN 6135-00-086-7530
NSN 6620-01-464-3087
NSN 5975-00-594-8857
NSN 5835-00-058-7017
NSN 6685-01-264-1359
NSN 5975-01-175-8839
NSN 5930-01-471-5657
NSN 5920-00-051-8277
NSN 5915-00-250-7912