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 6650-01-463-8405
NSN 5895-00-862-5564
NSN 5905-01-084-5716
NSN 6240-01-554-0363
NSN 5855-00-688-9954
NSN 5999-01-327-1491
NSN 4140-00-110-4524
NSN 5998-01-328-4963
NSN 6610-01-419-0929
NSN 5935-01-201-2599
NSN 7035-01-132-7209
NSN 6320-01-452-2394