Any person, copartnership, association or corporation, or his or its servants, agents or employes who shall violate any of the provisions of this act,¹ shall, upon conviction thereof in a summary proceeding, be sentenced for a first offense to pay a fine of not less than twenty-five dollars or more than fifty dollars and costs of prosecution and in default of the payment of such fine and costs of prosecution, shall be sentenced to imprisonment for not less than ten days or more than twenty days, and for conviction in a summary proceeding for a second offense, shall be sentenced to pay a fine of not less than fifty dollars nor more than one hundred dollars, or, in default of such fine and costs of prosecution, shall be sentenced to imprisonment for forty days; and any person, copartnership, association or corporation, or his or its servants, agents or employes, who shall violate any of the provisions of this act for a third or subsequent time, shall be guilty of a misdemeanor, and, upon conviction thereof, shall be sentenced to pay a fine of not less than two hundred and fifty dollars nor more than five hundred dollars, or to undergo imprisonment for sixty days, or both, at the discretion of the court.