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 5925-01-396-5582
NSN 6320-01-139-0533
NSN 5998-00-699-2514
NSN 5925-01-254-2578
NSN 6135-00-900-2139
NSN 5998-01-007-6185
NSN 6150-00-526-3720
NSN 6645-01-648-4439
NSN 7035-00-549-2722
NSN 5920-00-261-9848
NSN 7035-01-534-7074
NSN 6240-00-937-6083