3. Inventories (Tables)

12 Months Ended

Dec. 31, 2012

Inventories Tables

Inventories

	2011		2012
Materials	$	815,357	$	720,113
Work in process		25,641		––
Finished goods (including $822,000 and $489,400 held by customers at December 31, 2011 and 2012, respectively)		1,881,785		1,910,273
Total	$	2,722,783	$	2,630,386