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 6130-01-420-9155
NSN 5985-01-260-9482
NSN 6130-01-416-3082
NSN 6320-01-383-3257
NSN 5835-00-279-2887
NSN 5975-01-569-4005
NSN 6620-01-119-3396
NSN 5998-01-556-4250
NSN 5998-01-237-3202
NSN 6650-00-590-9073
NSN 5930-01-334-7836
NSN 6685-00-470-4775