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 5945-01-407-0385
NSN 6645-00-867-6724
NSN 5915-01-291-5325
NSN 6620-01-423-0833
NSN 5998-01-086-8480
NSN 5855-01-240-5470
NSN 2925-00-947-9814
NSN 6685-00-132-9906
NSN 5999-01-025-9377
NSN 5999-01-266-4622
NSN 5835-01-286-6499
NSN 6685-00-239-7469