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 5996-01-361-6463
NSN 6685-01-145-9568
NSN 5945-01-031-3006
NSN 6130-01-159-6153
NSN 6645-00-283-6794
NSN 6220-00-854-2532
NSN 5996-00-021-2112
NSN 5996-00-807-8749
NSN 5975-00-681-8707
NSN 5965-01-045-0247
NSN 4140-00-126-0247
NSN 6240-00-557-7471