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 5965-01-005-0341
NSN 5990-01-386-8051
NSN 5965-00-128-6426
NSN 5975-01-180-7205
NSN 6110-00-138-6691
NSN 6240-01-625-1279
NSN 5915-01-239-8931
NSN 2925-01-426-3410
NSN 6150-01-499-0181
NSN 5960-01-324-8751
NSN 5920-01-473-0997
NSN 6610-01-501-6630