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 5999-01-048-6369
NSN 5960-00-343-2888
NSN 6130-01-374-5133
NSN 5915-01-330-6485
NSN 6685-00-299-8496
NSN 6610-00-918-3389
NSN 6685-01-225-9564
NSN 6110-01-250-7168
NSN 6220-00-088-0348
NSN 6650-01-490-5205
NSN 6620-00-957-9325
NSN 5925-01-223-6382