# Relationship history for MSHA mine 4606398

Current hierarchy: **Massey Energy Company → Robinson-Phillips Coal Company Inc → Double Camp Branch**

- 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:** Massey Energy Company → Double Camp Branch; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Robinson-Phillips Coal Company Inc → Double Camp Branch; 1981-08-01 to 1986-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Robinson-Phillips Coal Company Inc; 1981-08-01 to 1986-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Lambert Charles → Double Camp Branch; 1983-02-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Horse Coal Mining & Sales Inc → Double Camp Branch; 1986-05-12 to 1987-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Lewis C → Double Camp Branch; 1986-05-12 to 1989-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Lewis C → Black Horse Coal Mining & Sales Inc; 1986-05-12 to 1987-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Lambert Coal Company Inc → Double Camp Branch; 1987-06-21 to 1989-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Lambert Charles → Lambert Coal Company Inc; 1987-06-21 to 1989-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Robinson-Phillips Coal Company Inc → Double Camp Branch; 1989-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Robinson-Phillips Coal Company Inc; 1989-01-23 to current/open; source msha-controller-operator-history