Rachel Hou/Shanghai Daily news

On July 5, Shanghai Zhenhua Port Machinery Co. announced that it had developed a new portainer crane which can hold and move four 40-foot containers at the same time.
The crane has two block and tackles attached to the boom at different heights, each capable of lifting two 4o-foot containers. The higher tackle lifts containers from cargo ships and moves them toward a transfer station, while the lower tackle will hoist them onto delivery trucks. 
Two such cranes have been ordered by Qingdao Port in east China's Shandong Province. 
As a kind of gantry crane, a portainer crane is a very large lifting machine used to load and unload container ships and is only seen at container ports. The most commonly used crane at present can hoist two 20-foot containers simultaneously.
Zhenhua Port Machinery Co, one of the world's biggest crane manufacturers, plans to make 190 various lifting machines this year with total sales exceeding US$1.5 billion.