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BLUE RIBBON COAL COMPANY <br /> PIEZOMEfER P-'I <br /> 0 - <br /> -2 - <br /> -4 <br /> -6 <br /> -8 <br /> X -1 <br /> s -12 >� <br /> w <br /> Q <br /> -14 '\ <br /> a -18 <br /> w -20 <br /> -22 <br /> -24 <br /> -26 <br /> -28 <br /> -30 <br /> 6/85 12/85 6/85 12/86 6/87 12/87 6/85 12,/88 6/89 12/89 <br /> DATE <br />