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 5985-01-514-0360
NSN 6685-01-008-1248
NSN 5975-01-425-1268
NSN 6150-00-071-3058
NSN 6150-00-372-4771
NSN 5895-01-369-8822
NSN 5950-01-272-8166
NSN 5915-01-381-2519
NSN 4140-01-137-3264
NSN 6645-01-472-5623
NSN 5998-00-285-8613
NSN 5835-01-312-4446