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 6320-01-344-6511
NSN 5985-01-007-8852
NSN 5945-01-381-1356
NSN 6645-01-329-0871
NSN 5965-00-100-1291
NSN 6610-01-293-0644
NSN 5996-01-266-0543
NSN 6145-01-640-6511
NSN 7035-00-557-5570
NSN 4140-00-370-0698
NSN 5920-00-221-8377
NSN 6610-00-007-6832