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 5985-01-479-2390
NSN 5925-00-954-3212
NSN 4140-01-251-0401
NSN 5965-01-320-9742
NSN 5935-00-757-5838
NSN 5945-01-339-5348
NSN 5935-00-187-5225
NSN 5996-01-479-2091
NSN 5895-00-407-7862
NSN 6145-01-515-9011
NSN 6685-00-177-5006
NSN 6650-00-695-0304