| Date | Description |
|---|---|
| 2019-08-29 | update robots_txt_status www.heartfieldresearch.com: 404 => 200 |
| 2017-07-21 | delete address P.O. Box 43054 Chicago, IL 60643 |
| 2017-07-21 | update primary_contact P.O. Box 43054 Chicago, IL 60643 => null |
| 2016-03-29 | delete source_ip 66.96.161.128 |
| 2016-03-29 | insert source_ip 66.96.149.32 |
| 2014-04-29 | delete alias Heartfield Research Assocates |