What does it mean that some brands of cans are marked with the English small letter BALL?

BALL is a large packaging company headquartered in the United States. China's name seems to be Bohr. It mainly produces beverage and food packaging containers, such as canned food. This kind of Coca-Cola can should be produced by them. Some packaging companies like to leave their own small logo on their own packaging, such as exal. Ball Company has a production line in China, and Tsingtao Beer also uses their cans.