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Product Warranty
6 Months Ended
Sep. 30, 2010
Product Warranty  
Product Warranty

9.       Product Warranty

The Company generally provides a one to two year warranty on its products, commencing upon installation. A provision is recorded upon revenue recognition to cost of revenues for estimated warranty expense based on historical experience.

Product warranty activity was as follows (in thousands):

Three months ended Six months ended
September 30, September 30,
2010 2009 2010 2009
Balance at beginning of period  $6,375 $5,325 $6,431 $4,749
Accruals for warranties during the period  2,020 1,602 4,332 2,717
Settlements and adjustments during the period  -1,021 -1,430 -3,389 -1,969
Balance at end of period  $7,374 $5,497 $7,374 $5,497