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 6685-01-584-5861
NSN 6320-00-089-9426
NSN 5998-01-246-4784
NSN 5920-01-096-1864
NSN 5960-00-561-8230
NSN 6220-01-068-4066
NSN 6650-01-339-5257
NSN 6610-00-949-9792
NSN 5965-01-025-5129
NSN 6620-00-684-3425
NSN 5950-01-426-1580
NSN 5855-01-216-7633