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 5996-00-005-2407
NSN 6145-00-656-5329
NSN 5855-00-151-3853
NSN 5915-01-424-3186
NSN 6620-00-905-6590
NSN 2925-01-359-4027
NSN 6145-01-439-0725
NSN 6145-01-234-6615
NSN 7035-01-227-7492
NSN 5915-01-631-1023
NSN 6135-00-708-0892
NSN 5835-01-044-2628