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 5855-00-494-9581
NSN 6150-01-008-1485
NSN 5930-00-150-2333
NSN 5915-00-989-9632
NSN 6240-01-123-0968
NSN 5945-00-100-1261
NSN 6135-01-222-0703
NSN 5930-00-344-3813
NSN 5905-00-102-9612
NSN 6130-01-200-7450
NSN 6240-00-143-6558
NSN 2925-01-535-3167