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 6240-01-580-0609
NSN 6610-00-301-6365
NSN 5915-00-997-8360
NSN 6130-00-716-4658
NSN 5905-00-556-9386
NSN 6320-00-845-3261
NSN 4140-01-586-2210
NSN 5925-01-441-9316
NSN 6320-01-369-5014
NSN 5910-01-440-9558
NSN 6610-00-756-0589
NSN 5925-00-554-4114