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 6240-00-304-7015
NSN 6110-00-914-6693
NSN 6220-00-227-8209
NSN 5835-01-339-0542
NSN 6130-01-305-1436
NSN 5895-00-862-5564
NSN 5985-00-921-7805
NSN 6130-01-277-0493
NSN 6240-01-490-4997
NSN 6620-01-519-2628
NSN 6685-00-899-1861
NSN 6220-00-937-5906