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 5835-01-170-5537
NSN 5950-01-526-5590
NSN 6145-00-109-8125
NSN 5996-00-168-9559
NSN 6645-00-566-5537
NSN 5945-01-615-0388
NSN 5915-00-922-1629
NSN 7035-00-312-3055
NSN 6150-01-541-2284
NSN 5915-00-765-6969
NSN 5998-00-115-0640
NSN 5965-01-231-5047