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 6130-01-071-9213
NSN 5945-01-517-5366
NSN 5975-01-162-2694
NSN 6240-00-013-4764
NSN 4140-01-614-9430
NSN 6145-01-273-1709
NSN 5985-01-528-8377
NSN 6685-01-056-5283
NSN 6145-01-175-9358
NSN 6645-01-573-7603
NSN 6645-01-159-8787
NSN 6685-01-577-9681