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Inventories (Details) - USD ($)	Aug. 31, 2018	Feb. 28, 2018
Inventories Tables Abstract
Raw materials and subassemblies	$ 871,012	$ 673,969
Finished goods	602,099	395,410
Work in process	418,054	489,082
Total	1,891,165	1,558,461
Less: Allowance	240,378	204,378
Net inventories	$ 1,650,787	$ 1,354,083

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