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 5990-00-212-4316
NSN 5910-01-372-5347
NSN 6650-01-483-4267
NSN 6320-01-416-7993
NSN 6220-00-175-5590
NSN 5999-01-214-6348
NSN 5895-00-324-0578
NSN 7035-00-585-2113
NSN 2925-01-448-2880
NSN 5950-01-434-3521
NSN 5945-00-666-4700
NSN 5855-00-494-9581