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 5925-01-056-8765
NSN 5920-01-369-4440
NSN 6620-01-430-4111
NSN 5975-01-284-6457
NSN 5965-00-035-4556
NSN 5985-01-303-2107
NSN 5905-01-385-0628
NSN 5920-01-095-4519
NSN 6145-00-250-4429
NSN 6645-01-037-7725
NSN 5960-01-128-0850
NSN 5975-01-268-1529