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 6645-01-532-9027
NSN 5990-01-565-2226
NSN 5905-01-339-2670
NSN 5996-01-342-8293
NSN 5835-00-341-5441
NSN 6610-01-633-8931
NSN 6130-00-994-2809
NSN 5925-01-579-9729
NSN 6685-01-026-0111
NSN 6130-01-611-4219
NSN 7035-01-183-7550
NSN 6610-00-925-0935