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 6620-01-285-4685
NSN 6685-01-406-6078
NSN 6320-01-498-4954
NSN 5895-01-232-0064
NSN 6110-01-132-2442
NSN 6135-01-014-9755
NSN 5998-01-135-3525
NSN 6650-00-137-5859
NSN 5910-00-071-3648
NSN 6130-01-056-5251
NSN 6645-01-111-9825
NSN 5910-00-292-0048