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 5935-01-528-0637
NSN 5895-00-276-0596
NSN 6320-01-102-0799
NSN 6240-01-384-8802
NSN 5835-00-491-3834
NSN 5925-01-008-0225
NSN 6240-00-350-9508
NSN 5960-01-478-9493
NSN 5945-00-074-8375
NSN 5855-01-451-1163
NSN 6685-01-063-3264
NSN 5925-00-580-0869