链动滑轮，吊车专用电动滑板，吊车专用手动滑板，悬臂起重机，铁路养路器械。
Chain blocks, crane - use electrical saddles, crane - use manual saddles, jib cranes, railroad maintenance equipment.
这个吊车的“秘密”在于：Facebook在之前租用的Palo Alto大楼地下室里发现了这个起重机，搬到新总部后就把它也一起带过来了。
Here's a 'secret' about the crane: Facebook found it in the basement of the former building they leased in Palo Alto and they snuck off with it when they moved into their new headquarters.
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