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PRODUCT WARRANTIES (Tables)
3 Months Ended
Mar. 31, 2017
Product Warranties Disclosures [Abstract]  
Schedule of changes in product warranty liability

Changes in product warranty liability were as follows for the three months ended March 31, 2017 (unaudited).

 

Balance, beginning of period   $ 40,481  
Warranties accrued during the period     80,754  
Payments on warranty claims     (68,932 )
Balance, end of period     52,303