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 6645-00-760-5599
NSN 6320-01-458-9567
NSN 6220-01-334-6975
NSN 2925-00-441-8252
NSN 6145-01-014-2670
NSN 6150-00-657-4759
NSN 5920-00-281-2488
NSN 6240-00-518-3541
NSN 5999-00-203-1202
NSN 5996-01-559-8221
NSN 5920-01-189-2354
NSN 6135-00-016-0071