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 6610-01-474-8520
NSN 6220-01-299-6790
NSN 5945-01-425-2986
NSN 6320-01-323-7565
NSN 5999-01-386-5834
NSN 6685-01-383-6522
NSN 5905-01-152-8326
NSN 5975-00-966-4323
NSN 5925-00-865-9618
NSN 6240-01-172-5981
NSN 5915-01-048-7027
NSN 6650-01-159-9151