Bitmain (17 series (reboll), 19 series, 9 series, dr5) Avalon ( beside 7,8,9 series) Whatsminer (all series) This is a repair shop that comes to Russia to repair Bitmain (17 series (reboll), 19 series, 9 series, dr5) Avalon ( beside 7,8,9 series) Whatsminer (all series), with superb repair technology and first-class service.