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 5920-00-653-0019
NSN 5835-00-136-9103
NSN 6150-01-382-9410
NSN 5925-01-139-3866
NSN 6145-00-879-7289
NSN 4140-01-634-0330
NSN 5945-01-423-9086
NSN 5895-01-193-6401
NSN 6145-01-488-5671
NSN 5895-00-132-6847
NSN 5998-00-560-7971
NSN 5910-00-205-2430