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 5996-01-381-4440
NSN 5998-00-548-4543
NSN 5920-00-463-3372
NSN 6320-00-731-6134
NSN 5999-01-516-0553
NSN 5990-01-200-7460
NSN 7035-00-529-3128
NSN 5925-01-574-7690
NSN 5990-00-843-2063
NSN 6610-00-202-5481
NSN 5985-01-369-3785
NSN 4140-01-486-0813