# Relationship history for MSHA mine 1516603

Current hierarchy: **Steele William Jr → Control Energies Inc → No 1 Prep Plant**

- 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:** Control Energies Inc → No 1 Prep Plant; 1989-04-01 to 1989-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Johnson John → No 1 Prep Plant; 1989-04-01 to 1989-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Johnson John → Control Energies Inc; 1989-04-01 to 1989-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Control Energies Inc → No 1 Prep Plant; 1989-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steele William Jr → No 1 Prep Plant; 1989-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steele William Jr → Control Energies Inc; 1989-09-12 to current/open; source msha-controller-operator-history