RADNOR, PA – Airgas, Inc. (NYSE: ARG) will release its fiscal 2013 fourth quarter earnings before the market opens on Thursday, May 2, 2013, and will host a teleconference at 10:00 a.m. ET that same day. The presentation materials will also be available before the market opens on May 2 on the Internet at <a href="http://investor.shareholder.com/arg/slides.cfm">http://investor.shareholder.com/arg/slides.cfm</a>. A webcast of the teleconference will be available live and on demand through ...