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 5935-01-491-7523
NSN 5985-01-431-1487
NSN 5910-01-351-2507
NSN 6220-01-634-0660
NSN 6150-00-153-3196
NSN 2925-00-176-3889
NSN 6220-01-123-9290
NSN 6105-01-157-3033
NSN 6645-01-521-0424
NSN 5960-00-519-6176
NSN 6620-01-423-0833
NSN 5925-01-074-5832