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 5996-01-506-0316
NSN 6150-00-465-1633
NSN 5895-01-545-4659
NSN 6320-00-360-1744
NSN 2925-01-236-0015
NSN 5950-01-541-5016
NSN 5990-01-341-5735
NSN 5925-00-233-5125
NSN 7035-00-916-9380
NSN 5920-00-140-8912
NSN 5920-01-109-2689
NSN 4140-01-611-3937