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 6130-01-205-2640
NSN 4140-01-378-6710
NSN 6145-01-352-7849
NSN 2925-00-190-2334
NSN 5835-01-447-2544
NSN 6320-00-004-9158
NSN 5985-00-317-8237
NSN 5975-01-330-0665
NSN 5985-01-114-8312
NSN 6150-00-934-1470
NSN 5960-00-946-7767
NSN 6135-01-400-2947