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 6320-01-089-9086
NSN 6135-01-617-0253
NSN 2925-00-640-8611
NSN 5910-01-547-6581
NSN 5990-00-583-9577
NSN 6105-01-599-5240
NSN 5960-01-391-8860
NSN 5920-01-648-5188
NSN 6645-00-542-1734
NSN 5996-00-226-5364
NSN 5915-01-469-7568
NSN 5855-00-110-9341