# Relationship history for MSHA mine 1518701

Current hierarchy: **Paul C  Combs; Shirley W  Combs → Johnson-Floyd Coal Company LLC → Johnson-Floyd Coal Company LLC Job 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Johnson-Floyd Coal Company LLC → Johnson-Floyd Coal Company LLC Job 1; 2004-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul C  Combs et al → Johnson-Floyd Coal Company LLC Job 1; 2004-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul C  Combs et al → Johnson-Floyd Coal Company LLC; 2004-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley W  Combs et al → Johnson-Floyd Coal Company LLC; 2004-01-05 to current/open; source msha-controller-operator-history