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 5835-00-264-0946
NSN 6220-01-446-4220
NSN 6110-01-511-9917
NSN 6645-01-450-7271
NSN 6135-01-243-5797
NSN 5985-01-233-2868
NSN 5930-01-626-5443
NSN 6110-00-592-7474
NSN 6650-00-652-3553
NSN 6130-01-221-1673
NSN 5975-01-507-8213
NSN 5835-00-165-3069