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Inventories (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Inventories
Finished products	$ 602,753	$ 321,378
Work-in-process	666,830	862,000
Raw materials	1,402,033	1,662,185
Net inventories	$ 2,671,616	$ 2,845,563

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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