Personnel engaged in special industries.
Not every company has special workers. They are special equipment operators. There is also a profession called special operators, which means the installation, operation, debugging, etc. of special equipment. The problem is that special job personnel and special operation personnel have different work nature and positions. They cannot be used cross-wise, but they are both in a special industry.
Electricians, metal welding, cutting, high-voltage line maintenance, crane operators, corporate heavy vehicle driving, aerial erection, dangerous goods operations, miners, and other similar jobs are all special operations.