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 6685-01-281-1224
NSN 6240-01-128-0906
NSN 6650-01-197-4585
NSN 5996-00-147-9323
NSN 6150-01-446-6941
NSN 6685-01-116-7773
NSN 5925-00-657-3092
NSN 5920-01-371-3112
NSN 5965-01-442-5405
NSN 6685-01-352-7241
NSN 7035-00-865-9105
NSN 6105-01-447-5129