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 6130-00-109-9091
NSN 6240-00-123-7648
NSN 6150-01-328-9624
NSN 6610-00-189-7520
NSN 6240-01-025-5847
NSN 5855-01-459-7508
NSN 6220-00-212-9098
NSN 5905-01-456-0300
NSN 6645-00-057-3499
NSN 6320-00-405-2348
NSN 5920-01-479-5808
NSN 6145-01-437-7710