52 Pa. Stat. § 70-214
It shall be the duty of each of the said boards to meet once every month and not oftener, and said meeting shall be public, and examine under oath all persons who shall desire to be employed as miners in their respective districts; and said board shall grant such persons as may be qualified, certificates of competency or qualification which shall entitle the holders thereof to be employed as and to do the work of miners as may be expressed in said certificate, and such certificate shall be good and sufficient evidence of registration and competency under this act; and the holder thereof shall be entitled to be registered without an examination in any other of the anthracite districts upon the payment of the fee herein provided.
52 P.S. § 70-214