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 6110-01-643-8208
NSN 5910-01-045-0128
NSN 5920-00-221-6439
NSN 6320-01-056-1164
NSN 6130-00-329-7773
NSN 5985-01-326-7799
NSN 5996-01-085-3748
NSN 5965-00-583-4865
NSN 6135-00-935-8769
NSN 5945-00-170-8632
NSN 5999-01-163-4257
NSN 6645-01-479-5364