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BLUE RIBBON COAL COMPANY <br /> PIEZOMEfER P-4 <br /> 0 <br /> -2 <br /> -4 <br /> -6 <br /> -8 <br /> r -10 <br /> w <br /> W -12 <br /> w <br /> 3 -14 <br /> -16 <br /> 0 <br /> -18 <br /> w <br /> o -20 � <br /> -22 <br /> -24 \ <br /> -26 <br /> -28 <br /> -30 <br /> 6/85 12/85 6/86 12/86 6/87 12/87 6/88 12/88 6/89 12/89 <br /> DATE <br />