# Relationship history for MSHA mine 1510317

Current hierarchy: **MidAmerican Energy Holdings Company → Ndg Inc → Owensboro River Terminal**

- 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

- **operator_operates_mine:** Mid-America Terminal Inc → Owensboro River Terminal; 1977-03-01 to 1978-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Meek Mack Inc → Owensboro River Terminal; 1977-03-01 to 1978-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Meek Mack Inc → Mid-America Terminal Inc; 1977-03-01 to 1978-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Mid America Terminal Inc → Owensboro River Terminal; 1978-11-01 to 1984-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Wolfe Industries Inc → Owensboro River Terminal; 1978-11-01 to 1984-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Wolfe Industries Inc → Mid America Terminal Inc; 1978-11-01 to 1984-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Ndg Inc → Owensboro River Terminal; 1984-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MidAmerican Energy Holdings Company → Owensboro River Terminal; 1984-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → Ndg Inc; 1984-01-23 to current/open; source msha-controller-operator-history