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 2925-01-025-0082
NSN 5915-01-258-6880
NSN 5999-01-472-2269
NSN 5965-01-267-8536
NSN 5975-01-284-8669
NSN 5910-00-176-7695
NSN 5925-01-615-5555
NSN 5930-01-483-2716
NSN 6135-00-122-2420
NSN 5925-00-553-2500
NSN 5930-01-139-3719
NSN 6145-01-240-7528