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 6320-01-631-7828
NSN 5950-01-144-1196
NSN 6135-00-767-0331
NSN 6685-01-100-1071
NSN 5965-00-460-8913
NSN 6110-01-481-3942
NSN 5930-00-269-2594
NSN 6240-01-266-7442
NSN 5990-00-155-2306
NSN 5950-01-609-4250
NSN 6145-01-491-0033
NSN 5915-00-226-6863