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 6620-01-401-5356
NSN 5950-01-615-4055
NSN 5990-00-133-7734
NSN 5930-01-415-3111
NSN 5999-01-104-2033
NSN 5895-00-554-4573
NSN 6610-00-584-5055
NSN 6220-01-158-0918
NSN 5990-01-517-7848
NSN 5895-00-803-3185
NSN 5925-00-394-6894
NSN 5975-01-634-0678