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 6150-00-457-8172
NSN 5835-01-412-6901
NSN 5920-01-384-5487
NSN 6620-00-309-9920
NSN 5990-00-254-4825
NSN 5930-01-428-4258
NSN 6145-01-581-4128
NSN 5996-01-534-6088
NSN 6320-00-186-6452
NSN 6610-01-588-1148
NSN 5910-01-343-9733
NSN 6620-01-308-0860