With President Xi Jinping expected to meet US President Donald Trump in Washington this week, attention is again turning to the tit-for-tat trade and technology restrictions between the two nations – a friction that continues to escalate despite occasional reprieves.Over the past year, tech firms and industrial manufacturers on both sides have been casualties of the ever-intensifying rivalry, even as some benefit from growing state support to cushion the blow.From lost sales and squeezed...