Every employer and every representative contractor within this Commonwealth must procure from the department an employer's permit. Application for such permit shall be made on a form prescribed by the department. Such permit shall be in writing, dated when issued, and signed by the Secretary of Labor and Industry, or his duly authorized representative. It shall give the name and address of the person to whom it is issued and shall designate and limit the acts that are permitted. Such permit shall be valid for a period of one year from the date of its issuance, unless sooner revoked.
43 P.S. § 491-7