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 6110-00-244-8542
NSN 7035-00-001-4586
NSN 6150-01-571-4996
NSN 2925-01-516-9858
NSN 6240-00-866-6239
NSN 6610-00-786-7080
NSN 5998-01-150-5361
NSN 6130-01-034-6057
NSN 6145-01-161-2668
NSN 5965-00-284-7456
NSN 5975-00-837-3293
NSN 4140-01-435-6540