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 2925-00-608-0856
NSN 6620-00-035-5813
NSN 6320-01-211-6578
NSN 6610-00-829-5411
NSN 6240-01-415-3014
NSN 5915-01-575-3695
NSN 6240-00-024-5086
NSN 5996-00-518-0460
NSN 5915-00-154-0162
NSN 6145-00-226-0515
NSN 5999-01-451-4906
NSN 5950-00-278-4186