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 5925-00-165-0371
NSN 6620-01-034-7636
NSN 5965-01-249-6349
NSN 5999-01-179-5773
NSN 5835-01-530-8919
NSN 6220-00-792-8418
NSN 4140-00-260-9521
NSN 5910-01-569-3771
NSN 6610-01-146-8061
NSN 4140-01-226-9670
NSN 5999-01-634-0576
NSN 6130-00-455-2423