A joke caused by a wrong abbreviation

Tieling boiler plant, referred to as iron pot;

Baotou Zimukou Factory, referred to as steamed stuffed bun;

Huai 'an Transportation Company, referred to as Huaiyun;

Kaifeng tool factory, referred to as operation;

Shanghai Institute of Surveying and Mapping;

Shanghai crane factory, referred to as crane;

Zigong pesticide plant, referred to as suicide.