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 5920-01-310-9281
NSN 6610-01-023-1918
NSN 6150-01-153-2796
NSN 6150-01-133-6034
NSN 5975-01-362-6388
NSN 6150-01-472-5490
NSN 5930-01-389-4459
NSN 6110-01-411-6000
NSN 5960-00-322-8562
NSN 6145-01-446-5421
NSN 5950-01-464-0042
NSN 5965-01-065-5544