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 7035-01-311-7660
NSN 5905-01-390-9409
NSN 5835-01-100-3265
NSN 5915-00-269-2748
NSN 7035-01-068-5077
NSN 5905-01-242-3299
NSN 5945-01-045-9397
NSN 5930-00-821-6840
NSN 6145-00-801-4621
NSN 5905-01-234-1309
NSN 7035-01-435-4009
NSN 6650-01-560-8576