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Tantech Holdings' (TANH) subsidiary launches new driverless and autonomous street sweeping machine, Shangchi SC-100A.The Shangchi SC-100A follows the launch last month of the SC-120A model featuring unmanned, automatic sweeping.The said machine are designed for quieter operation and improved cleaning performance, with the ability to reduce the 7 to 8 humans required for typical sweeper vehicle operation.Shares +6% premarket.