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Document Designation and Title Year Select Item(s) D2639 Standard Test Method for Plastic Properties of Coal by the Constant-Torque Gieseler Plastometer 04e1 D2639 Standard Test Method for Plastic Properties of Coal by the Constant-Torque Gieseler Plastometer 04 D2639 Standard Test Method for Plastic Properties of Coal by the Constant-Torque Gieseler Plastometer 98