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REVENUE (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue |
Disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended | ​ | For the Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Sales to do-it-yourself customers | ​ | $ | 1,992,778 | ​ | $ | 1,869,079 | ​ | $ | 5,773,345 | ​ | $ | 5,067,676
Sales to professional service provider customers |  | ​ | 1,408,747 |  | ​ | 1,264,802 |  | ​ | 4,032,050 |  | ​ | 3,510,031
Other sales and sales adjustments |  | ​ | 78,045 |  | ​ | 73,757 |  | ​ | 230,675 |  | ​ | 198,013
Total sales | ​ | $ | 3,479,570 | ​ | $ | 3,207,638 | ​ | $ | 10,036,070 | ​ | $ | 8,775,720

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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