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 5910-00-764-1707
NSN 5855-00-879-7245
NSN 6105-01-451-8440
NSN 5855-01-147-6024
NSN 6145-00-342-8122
NSN 5895-01-088-8369
NSN 5960-01-235-8941
NSN 6320-00-894-1644
NSN 6610-01-406-4985
NSN 5895-01-653-9751
NSN 6220-00-186-8565
NSN 5910-01-289-3912