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4. Inventories (Tables)
6 Months Ended
Jun. 30, 2013
Notes to Financial Statements  
Inventories

    June 30,
2013
    December 31,
2012
 
Raw materials   $ 392,220     $ 398,510  
Work in progress     107,004       116,319  
Finished goods     93,914       141,568  
Total   $ 593,138     $ 656,397