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 2925-01-420-2362
NSN 6130-01-135-9633
NSN 5905-00-445-6571
NSN 5915-01-338-3556
NSN 5935-00-992-5309
NSN 6645-01-202-7986
NSN 5996-01-289-9347
NSN 6220-01-502-9451
NSN 6320-00-036-3688
NSN 5990-01-035-6869
NSN 5925-01-419-3030
NSN 5910-00-247-7225