# Relationship history for MSHA mine 1516660

Current hierarchy: **Randy  Johnson → Westerman Coal Company Inc → Westerman #3**

- 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:** Randy  Johnson et al → Westerman #3; 1984-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christian Richard A → Westerman #3; 1987-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Christian Energies Inc → Westerman #3; 1989-07-01 to 1991-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Christian Richard A → Christian Energies Inc; 1989-07-01 to 1991-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Westerman Coal Company Inc → Westerman #3; 1991-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Johnson et al → Westerman Coal Company Inc; 1991-01-18 to current/open; source msha-controller-operator-history