<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1000
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   9-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-END>                               DEC-31-1997             SEP-30-1997             JUN-30-1997             MAR-31-1997
<CASH>                                           2,247                   3,119                   5,310                   2,140
<SECURITIES>                                     3,272                   3,211                   3,153                   3,688
<RECEIVABLES>                                   13,574                   9,606                  13,497                  15,334
<ALLOWANCES>                                     (544)                   (514)                   (409)                   (472)
<INVENTORY>                                     14,895                  16,610                  14,097                  12,868
<CURRENT-ASSETS>                                34,928                  33,829                  37,647                  35,821
<PP&E>                                          15,386                  17,286                  17,074                  15,999
<DEPRECIATION>                                (11,817)                (13,279)                (12,580)                (11,028)
<TOTAL-ASSETS>                                  49,447                  48,970                  53,859                  53,205
<CURRENT-LIABILITIES>                            9,684                  10,196                  12,160                  11,005
<BONDS>                                          9,620                   8,219                   8,904                   9,949
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        35,326                  35,222                  35,200                  35,199
<OTHER-SE>                                     (5,783)                 (6,519)                 (4,442)                 (4,896)
<TOTAL-LIABILITY-AND-EQUITY>                    49,447                  48,970                  53,859                  53,205
<SALES>                                         66,004                  48,848                  35,237                  16,858
<TOTAL-REVENUES>                                66,004                  48,848                  35,237                  16,858
<CGS>                                           33,988                  25,391                  17,989                   8,772
<TOTAL-COSTS>                                   11,686                   8,814                   5,828                   2,881
<OTHER-EXPENSES>                                19,575                  15,085                   9,705                   4,663
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                               1,126                     861                     567                     291
<INCOME-PRETAX>                                  (770)                 (1,606)                     952                     138
<INCOME-TAX>                                       201                      51                     418                      41
<INCOME-CONTINUING>                              (971)                 (1,657)                     534                      97
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     (971)                 (1,657)                     534                      97
<EPS-PRIMARY>                                    (.18)                   (.30)                     .08                     .02
<EPS-DILUTED>                                    (.18)                   (.30)                     .08                     .02
        

</TABLE>