<ARTICLE> 5 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> JUN-30-1998 <CASH> 2,533,000 <SECURITIES> 0 <RECEIVABLES> 15,239,000 <ALLOWANCES> (583,000) <INVENTORY> 521,000 <CURRENT-ASSETS> 19,399,000 <PP&E> 30,866,000 <DEPRECIATION> (17,342,000) <TOTAL-ASSETS> 50,879,000 <CURRENT-LIABILITIES> 24,503,000 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 20,608,000 <OTHER-SE> 0 <TOTAL-LIABILITY-AND-EQUITY> 50,879,000 <SALES> 25,893,000 <TOTAL-REVENUES> 25,893,000 <CGS> 15,693,000 <TOTAL-COSTS> 15,693,000 <OTHER-EXPENSES> 5,496,000 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 241,000 <INCOME-PRETAX> 4,479,000 <INCOME-TAX> 1,836,000 <INCOME-CONTINUING> 2,643,000 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 2,643,000 <EPS-PRIMARY> 0.27 <EPS-DILUTED> 0.27