# Relationship history for MSHA mine 1201895

Current hierarchy: **Hediger Walter → Energy Supply Of Indiana Inc → Venturi Pit #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Venturi Robert W → Venturi Pit #1; 1976-10-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Supply Inc → Venturi Pit #1; 1982-07-01 to 1990-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Venturi Robert W → Energy Supply Inc; 1982-07-01 to 1990-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Energy Supply Of Indiana Inc → Venturi Pit #1; 1990-04-25 to 1992-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Powers Earl → Venturi Pit #1; 1990-04-25 to 1992-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Powers Earl → Energy Supply Of Indiana Inc; 1990-04-25 to 1992-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Energy Supply Of Indiana Inc → Venturi Pit #1; 1992-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hediger Walter → Venturi Pit #1; 1992-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hediger Walter → Energy Supply Of Indiana Inc; 1992-05-05 to current/open; source msha-controller-operator-history