<ARTICLE> 5
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>               DEC-31-1997
<PERIOD-END>                    JUN-30-1997
<CASH>                                       4,262,550
<SECURITIES>                                         0
<RECEIVABLES>                                2,514,743
<ALLOWANCES>                                         0
<INVENTORY>                                    221,961
<CURRENT-ASSETS>                             7,648,910
<PP&E>                                      21,173,441
<DEPRECIATION>                              17,007,291
<TOTAL-ASSETS>                              14,057,023
<CURRENT-LIABILITIES>                        1,052,691
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                    339,407
<COMMON>                                     2,687,211
<OTHER-SE>                                   9,797,428
<TOTAL-LIABILITY-AND-EQUITY>                14,057,023
<SALES>                                      7,322,625
<TOTAL-REVENUES>                             7,503,189
<CGS>                                        5,744,669
<TOTAL-COSTS>                                6,847,670
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                655,519
<INCOME-TAX>                                   263,000
<INCOME-CONTINUING>                            392,519
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   392,519
<EPS-PRIMARY>                                      .01
<EPS-DILUTED>                                      .01