# Relationship history for MSHA mine 4609286

Current hierarchy: **Lexington Coal Holdings, Inc → Lexington Coal Company → Mine No 6**

- 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:** Franklin D  Robertson  et al → Mine No 6; 2003-07-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal River Mining LLC → Mine No 6; 2008-06-26 to 2018-05-22; source msha-controller-operator-history
- **controller_controls_operator:** Franklin D  Robertson  et al → Coal River Mining LLC; 2008-06-26 to 2018-05-22; source msha-controller-operator-history
- **controller_controls_operator:** James O  Bunn  et al → Coal River Mining LLC; 2008-06-26 to 2018-05-22; source msha-controller-operator-history
- **controller_controls_mine:** Lexington Coal Holdings, Inc → Mine No 6; 2017-10-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Coal Company → Mine No 6; 2018-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lexington Coal Holdings, Inc → Lexington Coal Company; 2018-05-23 to current/open; source msha-controller-operator-history