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Inventories (Details) (USD $) In Thousands, unless otherwise specified | Jun. 28, 2014 | Dec. 28, 2013
--- | --- | ---
Component of inventories |  |
Raw materials and sub-assemblies | $ 20,754 | $ 19,655
Work in process | 8,943 | 7,597
Finished goods | 8,056 | 7,268
Inventories | 37,753 | 34,520
Inventories-delivered systems | 358 | 6,901
Total inventories | $ 38,111 | $ 41,421

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