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 6650-01-452-8302
NSN 6685-00-802-9294
NSN 5915-00-948-3574
NSN 5905-01-569-3918
NSN 5945-01-089-7220
NSN 6320-01-116-3980
NSN 5930-01-428-5891
NSN 5990-01-521-7890
NSN 5920-01-435-6052
NSN 5915-00-151-4629
NSN 6150-01-081-2706
NSN 6650-01-465-5362