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 5895-00-167-1117
NSN 5925-01-281-5503
NSN 5905-01-098-7591
NSN 5925-01-049-5694
NSN 5999-01-376-8977
NSN 5855-01-290-3248
NSN 2925-01-539-9795
NSN 6110-01-367-6526
NSN 6130-01-045-7418
NSN 6105-00-003-6141
NSN 6685-01-281-7267
NSN 5925-01-653-1430