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PRODUCT WARRANTIES (Tables)
3 Months Ended
Mar. 31, 2019
Product Warranties Disclosures [Abstract]  
Schedule of changes in product warranty liability

Changes in product warranty liability were as follows for the nine months ended March 31, 2019:

 

Balance, beginning of period   $ 136,217  
Warranties accrued during the period     59,638  
Payments on warranty claims     (57,913 )
Balance, end of period   $ 137,942