Unregistered Sales of Equity Securities and Use of Proceeds.
−Removed: There were no unregistered sales of equity securities during the three months ended March 31, 2020 .
−Removed: There were no shares of common stock purchased by us during the three months ended March 31, 2020 .
+Added: There were no unregistered sales of equity securities during the three months ended June 30, 2020 .
+Added: There were no shares of common stock purchased by us during the three months ended June 30, 2020 .
On July 21, 2008, our Board of Directors approved an increase in our open-market share purchase program for up to 30 million shares.
1 unchanged sentence
This program does not have an expiration date.
−Removed: At March 31, 2020 , there were 23.7 million shares that could still be purchased under the program.
+Added: At June 30, 2020 , there were 23.7 million shares that could still be purchased under the program.
Mine Safety Disclosures.
4 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.