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Inventories (Details) - USD ($)	Aug. 31, 2017	Feb. 28, 2017
Inventories Tables
Raw materials and subassemblies	$ 1,169,913	$ 1,197,506
Finished goods	507,157	369,428
Work in process	193,967	28,460
Total	1,871,037	1,595,394
Less: Allowance	305,311	254,710
Net inventories	$ 1,565,726	$ 1,340,684

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