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 5945-01-592-3379
NSN 5835-00-233-6327
NSN 5925-00-435-8391
NSN 6620-01-261-2985
NSN 6135-00-087-5300
NSN 5990-01-463-5400
NSN 5999-00-578-3557
NSN 6135-01-420-5907
NSN 6645-01-123-4443
NSN 7035-01-322-8180
NSN 4140-01-535-5644
NSN 5998-01-430-1888