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 5925-01-155-7697
NSN 5925-01-200-9321
NSN 5910-00-004-5543
NSN 6145-01-468-5467
NSN 5996-00-930-4466
NSN 6240-01-225-8518
NSN 6645-01-231-9891
NSN 6105-00-111-2546
NSN 7035-01-107-2811
NSN 6240-00-081-4561
NSN 5925-01-526-1894
NSN 5905-01-265-1088