Visitors watch a coffee?making robotic arm at Shenzhen?based DH?Robotics’ booth during the 138th Canton Fair in Guangzhou on Thursday. More than 1,370 Shenzhen-based companies are taking part in the fair, occupying over 3,000 booths. On the fair’s opening day Wednesday, Shenzhen exhibitors closed deals worth US$115 million, four times the amount recorded on the first day of last autumn’s fair, the city’s commerce bureau said. The fair will run through Nov. 4. P3>Xinhua | 