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Inventories (Details) - USD ($)	Nov. 30, 2018	Feb. 28, 2018
Inventories Tables Abstract
Raw materials and subassemblies	$ 872,430	$ 673,969
Finished goods	650,401	395,410
Work in process	472,432	489,082
Total	1,995,263	1,558,461
Less: Allowance	252,378	204,378
Net inventories	$ 1,742,885	$ 1,354,083

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