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Warranties (Tables)
9 Months Ended
Sep. 30, 2020
Warranties  
Changes in product warranty liabilities

Warranty liabilities, balance at December 31, 2019

$

61,069

Warranty claims

 

(82,359)

Warranty accruals

 

88,059

Warranty liabilities, balance at September 30, 2020

$

66,769