Exhibit 3.1

CERTIFICATE OF INCORPORATION

OF

PX ACQUISITION CO.

FIRST: The name of the Corporation is PX Acquisition Co.

SECOND: The address of the Corporation’s registered office in the State of Delaware is Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County of New Castle 19801. The name of its registered agent at such address is The Corporation Trust Company.

THIRD: The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware.

FOURTH: The total number of shares of stock that the Corporation shall have authority to issue is three thousand (3,000) shares, all of which shall be Common Stock, $0.01 par value per share.

FIFTH: The name and mailing address of the incorporator is as follows:

Name	Mailing Address
Dennis B. Angers	Baker & Hostetler LLP
	PNC Center
	1900 East 9th Street
	Suite 3200
	Cleveland, OH 44114

SIXTH: Meetings of stockholders shall be held at such place, within or without the State of Delaware, as may be designated by or in the manner provided in the By-laws of the Corporation, or, if not so designated, at the registered office of the Corporation in the State of Delaware. Elections of directors need not be by written ballot unless and to the extent that the By-laws so provide.

THE UNDERSIGNED, being the incorporator above named for the purposes of forming a corporation pursuant to the General Corporation Law of the State of Delaware, has signed this instrument the 28th day of April, 2015, and does thereby acknowledge that it is his act and deed and that the facts stated therein are true.

Dennis B. Angers, Incorporator