ZPMC

Zhenhua Port Machinery Company (ZPMC) is one of those companies few people have ever heard of, but almost everyone knows their product.  Specifically they mass produce these:

They finish on average one a day, 365 days a year.  They have more than 75% of the market.  As you can guess their site is huge, really huge:

If you have Goggle Earth (and everyone should) go to 31-23-47 N / 121-38-30 E.  Have I mentioned the place is really huge?  35, 000 people work here..