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 5965-00-653-4782
NSN 5965-00-150-1144
NSN 5975-01-427-3521
NSN 6650-01-428-9958
NSN 2925-01-459-8093
NSN 5945-01-153-7280
NSN 6645-01-351-1154
NSN 6220-00-453-3179
NSN 6685-00-231-8646
NSN 5920-01-652-8395
NSN 5998-01-254-0297
NSN 5975-01-399-7364