In 1903, he designed a device to hold signal flags on the ends of trains.

1903 年，他设计了一种装置，可以在火车尾部悬挂信号旗。

(4) Prepare and check signal flags, make sure that the Port Clearance and other formalities are well prepared.

（4）准备并检查信号旗，确保通关等手续齐全。