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Inventories (Details) - USD ($)	May 31, 2017	Feb. 28, 2017
Inventories Tables
Raw materials and subassemblies	$ 1,130,293	$ 1,197,506
Finished goods	365,098	369,428
Work in process	99,940	28,460
Total	1,595,331	1,595,394
Less: Allowance	281,710	254,710
Net inventories	$ 1,313,621	$ 1,340,684

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