# Relationship history for MSHA mine 1518803

Current hierarchy: **Troy Lee  Girdner → Girdner Trucking & Mine Supply, LLC → No. 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Rhonda  Duerr → No. 1; 2002-07-17 to 2006-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Frank H  Ikerd III → No. 1; 2003-02-06 to 2005-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Ikerd Coal Company, LLC → No. 1; 2004-09-09 to 2007-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Frank H  Ikerd III → Ikerd Coal Company, LLC; 2004-09-09 to 2005-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Timothy L  Webb → No. 1; 2005-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy L  Webb → Ikerd Coal Company, LLC; 2005-06-10 to 2007-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Troy Lee  Girdner → No. 1; 2006-04-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Myjoy Coal LLC → No. 1; 2007-03-05 to 2008-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Rhonda  Duerr → Myjoy Coal LLC; 2007-03-05 to 2006-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Troy Lee  Girdner → Myjoy Coal LLC; 2007-03-05 to 2008-10-27; source msha-controller-operator-history
- **operator_operates_mine:** Girdner Trucking & Mine Supply, LLC → No. 1; 2008-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy Lee  Girdner → No. 1; 2008-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy Lee  Girdner → Girdner Trucking & Mine Supply, LLC; 2008-10-28 to current/open; source msha-controller-operator-history