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 6130-01-458-4256
NSN 5965-01-445-7995
NSN 5925-00-803-5491
NSN 5910-01-009-1910
NSN 5996-01-290-4844
NSN 4140-00-740-2153
NSN 6320-01-459-6992
NSN 5996-01-352-2487
NSN 7035-01-535-7320
NSN 6110-01-424-1208
NSN 6645-01-292-5092
NSN 5925-01-551-4116