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 5910-01-283-0898
NSN 4140-00-113-1279
NSN 6240-01-453-6482
NSN 6320-00-360-1744
NSN 6220-01-504-9294
NSN 6135-00-175-7132
NSN 5910-00-799-8887
NSN 5855-00-132-4898
NSN 6610-01-236-8359
NSN 6620-00-820-9616
NSN 5910-01-265-0816
NSN 4140-01-152-6600