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 5855-00-411-8688
NSN 5950-00-858-2008
NSN 6145-01-207-0445
NSN 6650-01-460-3876
NSN 7035-01-388-6943
NSN 7035-00-009-8705
NSN 4140-00-815-5208
NSN 6145-00-764-4338
NSN 5895-01-177-4379
NSN 6105-01-196-5444
NSN 5950-01-634-0677
NSN 5925-01-051-3268