# Relationship history for MSHA mine 1511878

Current hierarchy: **Benjamin R.  Bennett → Rb Coal Company Inc → 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

- **controller_controls_mine:** Duke Power Company → Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastover Mining Company → Prep Plant; 1979-05-01 to 1983-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Duke Power Company → Eastover Mining Company; 1979-05-01 to 1983-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin R.  Bennett → Prep Plant; 1979-11-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rb Coal Company Inc → Prep Plant; 1983-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R.  Bennett → Rb Coal Company Inc; 1983-08-04 to current/open; source msha-controller-operator-history