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 5910-01-398-1623
NSN 5999-01-595-0283
NSN 7035-00-104-7613
NSN 5920-01-457-8398
NSN 6610-00-949-9792
NSN 5975-01-312-5552
NSN 5985-01-616-3656
NSN 5915-00-847-6737
NSN 5855-01-278-8922
NSN 5930-00-500-9077
NSN 5965-00-932-4591
NSN 5915-01-027-0800