Why do factories often take photos of equipment?

Why do factories often take photos of equipment? Daoke Baba asked that the reason why the maintenance parts were photographed at the factory gate was because the installation master needed to take pictures for the company to confirm. When the installation master is repairing the factory door, the repaired parts must be photographed and left to the company for confirmation, which is also a proof that he really used it instead of being greedy for ink. Photography, also known as photography, generally refers to the process of exposing photosensitive media with light reflected by objects. Usually, cameras are made of silver salt photosensitive materials (film, film, dry plate, wet plate, etc.). ) or digital camera (ccd, cmos, etc. ) is used.