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PRODUCT WARRANTIES (Tables)
3 Months Ended
Mar. 31, 2018
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, 2018:

 

Balance, beginning of period   $ 146,722  
Warranties accrued during the period     36,790  
Payments on warranty claims     (43,467 )
Balance, end of period   $ 140,045