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                                   Exhibit 21
                         SUBSIDIARIES OF THE REGISTRANT



                                           STATE OF
SUBSIDIARY                               INCORPORATION
- ----------                               -------------
                                                  
The Canton Oil & Gas Company                  Ohio
                                         
    Target Oilfield Pipe & Supply Company     Ohio
                                         
Ward Lake Drilling, Inc.                      Michigan
                                         
Peake Energy, Inc.                            Delaware
                                         
Engine Power Systems, Inc.                    Ohio

                                       
As of December 31, 1996, the other subsidiaries included in the registrant's
consolidated financial statements, and all other subsidiaries considered in the
aggregate as a single subsidiary, did not constitute a significant subsidiary.