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74240614 27 Jan 1992 | on 02 Mar 1993 | high strength high conductivity media for oil and gas well fracturing ... Class 001 Class 001 Chemical Products high strength high conductivity media for oil and gas well fracturing use in shallow wells and deep wells for preventing closure Class 003 Class 003 Cosmetics and Cleaning Products roadmaking material use for surface finishing for anti-skid paving Class 019 Non-Metallic Building Material Products high strength high conductivity media for oil and gas well fracturing use in shallow wells and deep wells for preventing closure | |