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 6650-01-391-6072
NSN 5910-01-324-6538
NSN 6110-00-525-3418
NSN 5985-00-842-1418
NSN 6130-01-608-3861
NSN 6645-00-155-2398
NSN 5915-01-350-3696
NSN 4140-01-474-1651
NSN 5915-01-166-5712
NSN 5905-00-362-7372
NSN 6220-01-076-0018
NSN 6105-01-157-5914