# Relationship history for MSHA mine 1518615

Current hierarchy: **Timothy L  Webb → Ikerd Coal Company LLC → Runion Job**

- 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:** Frank H  Ikerd III → Runion Job; 2003-02-06 to 2005-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Ikerd Coal Company LLC → Runion Job; 2003-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank H  Ikerd III → Ikerd Coal Company LLC; 2003-02-27 to 2005-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Timothy L  Webb → Runion Job; 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 current/open; source msha-controller-operator-history