In Department of Licenses and Inspections, Board of License and Inspection Review v. Weber, 394 Pa. 466, 147 A.2d 326, 50 Mun. L Rep. 249 (1959), the Court explained two of the three closely related forms of preemption as follows: Of course, it is obvious that where a statute specifically declares it has planted the flag of preemption in a field, all ordinances on the subject die away as if they did not exist. It is also apparent that, even if the statute is silent on supersession, but proclaims a course of regulation and control which brooks no municipal intervention, all ordinances touching the topic of exclusive control fade away into the limbo of 'innocuous desuetude.' Id. at 327.