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PRODUCT WARRANTIES (Tables)
9 Months Ended
Sep. 30, 2017
Product Warranties Disclosures [Abstract]  
Schedule of changes in product warranty liability

Changes in product warranty liability were as follows for the nine months ended September 30, 2017 (unaudited).:

 

Balance, beginning of period   $ 40,481  
Warranties accrued during the period     174,723  
Payments on warranty claims     (104,724 )
Balance, end of period   $ 110,480