# Relationship history for MSHA mine 4606502

Current hierarchy: **Randy P  Key → Key Coal Company → Mine 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Key Coal Company → Mine No 1; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy P  Key → Mine No 1; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy P  Key → Key Coal Company; 1982-03-01 to current/open; source msha-controller-operator-history