<TABLE> <S> <C>

<ARTICLE>                     5
<MULTIPLIER>                  1,000
       
<S>

                                                       <C>                          <C>  
<PERIOD-TYPE>                                          6-MOS
<FISCAL-YEAR-END>                                                                   APR-30-1996
<PERIOD-END>                                                                        OCT-26-1996
<CASH>                                                                               2,066
<SECURITIES>                                                                        34,923
<RECEIVABLES>                                                                       12,326
<ALLOWANCES>                                                                           397
<INVENTORY>                                                                         12,625
<CURRENT-ASSETS>                                                                    63,730
<PP&E>                                                                             106,265
<DEPRECIATION>                                                                      75,841
<TOTAL-ASSETS>                                                                     134,075
<CURRENT-LIABILITIES>                                                               17,879
<BONDS>                                                                                  0
<COMMON>                                                                               858
<PREFERRED-MANDATORY>                                                                    0
<PREFERRED>                                                                              0
<OTHER-SE>                                                                          89,837
<TOTAL-LIABILITY-AND-EQUITY>                                                       134,075
<SALES>                                                                             98,864
<TOTAL-REVENUES>                                                                    98,864
<CGS>                                                                               58,325
<TOTAL-COSTS>                                                                       21,466
<OTHER-EXPENSES>                                                                    17,767
<LOSS-PROVISION>                                                                         0
<INTEREST-EXPENSE>                                                                       0
<INCOME-PRETAX>                                                                      2,232
<INCOME-TAX>                                                                           804
<INCOME-CONTINUING>                                                                  1,428
<DISCONTINUED>                                                                           0
<EXTRAORDINARY>                                                                          0
<CHANGES>                                                                                0
<NET-INCOME>                                                                         1,428
<EPS-PRIMARY>                                                                            0.88
<EPS-DILUTED>                                                                            0