Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. 

/s/PricewaterhouseCoopers LLP Philadelphia, Pennsylvania February 11, 2019 

We have served as the Company’s auditor since 1954.$^{ }$ 

