# Relationship history for MSHA mine 4604190

Current hierarchy: **CONSOL Energy Inc → Laurel Run Mining Company → Potomac Mine**

- 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:** Occidental Petroleum Corp → Potomac Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Virginia Electric & Power Company → Potomac Mine; 1950-01-01 to 1986-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Run Mining Company → Potomac Mine; 1974-01-01 to 1986-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Virginia Electric & Power Company → Laurel Run Mining Company; 1974-01-01 to 1986-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Run Mining Company → Potomac Mine; 1986-08-18 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Laurel Run Mining Company; 1986-08-18 to 1993-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Run Mining Company → Potomac Mine; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CONSOL Energy Inc → Potomac Mine; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CONSOL Energy Inc → Laurel Run Mining Company; 1993-07-01 to current/open; source msha-controller-operator-history