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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Inventory components

Inventories consist principally of raw materials and sub-assemblies, which are stated at the lower of cost (first-in, first-out) or market.

 

   June 30,  December 31,
   2015  2014
Raw materials and sub-assemblies   $602,545   $930,886 
Finished goods    18,547    26,441 
   $621,092  $957,327