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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Component of inventories
Raw materials and sub-assemblies	$ 19,349	$ 22,477
Work in process	8,392	5,812
Finished goods	8,802	11,370
Inventories	36,543	39,659
Inventories-delivered systems	2,313	2,274
Total inventories	$ 38,856	$ 41,933

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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