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Inventories (Details) - USD ($)	Nov. 30, 2017	Feb. 28, 2017
Inventories Tables
Raw materials and subassemblies	$ 1,153,908	$ 1,197,506
Finished goods	413,595	369,428
Work in process	268,036	28,460
Total	1,835,539	1,595,394
Less: Allowance	332,311	254,710
Net inventories	$ 1,503,228	$ 1,340,684

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