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 6145-01-271-6942
NSN 6130-00-300-1689
NSN 5945-00-132-3042
NSN 5855-01-027-1571
NSN 5960-00-908-8658
NSN 6320-01-592-6248
NSN 5835-01-652-4959
NSN 5985-01-220-4298
NSN 6220-01-237-5999
NSN 5910-01-351-4667
NSN 6150-01-301-9088
NSN 5925-01-457-0289