# Relationship history for MSHA mine 4604940

Current hierarchy: **Massey Energy Company → Robinson-Phillips Coal Company Inc → Ace #64 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:** Massey Energy Company → Ace #64 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Robinson-Phillips Coal Company Inc → Ace #64 Mine; 1975-10-31 to 1985-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Robinson-Phillips Coal Company Inc; 1975-10-31 to 1985-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Osborne Ted & Mark → Ace #64 Mine; 1985-09-09 to 1986-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Country Boy Coal Company Inc → Ace #64 Mine; 1985-12-05 to 1986-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Kennedy Virgil → Ace #64 Mine; 1985-12-05 to 1986-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Kennedy Virgil → Country Boy Coal Company Inc; 1985-12-05 to 1986-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Osborne Brothers Construction Company Inc → Ace #64 Mine; 1986-01-02 to 1986-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Osborne Ted & Mark → Osborne Brothers Construction Company Inc; 1986-01-02 to 1986-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Black Horse Coal Mining & Sales Inc → Ace #64 Mine; 1986-05-12 to 1987-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Lewis C → Ace #64 Mine; 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 1987-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Harman William J → Ace #64 Mine; 1986-10-20 to 1988-02-23; source msha-controller-operator-history
- **operator_operates_mine:** W C & H Coal Company Inc → Ace #64 Mine; 1987-05-30 to 1988-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Harman William J → W C & H Coal Company Inc; 1987-05-30 to 1988-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Powers Melvin → Ace #64 Mine; 1987-11-17 to 1989-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Mels Enterprises Inc → Ace #64 Mine; 1988-02-24 to 1989-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Powers Melvin → Mels Enterprises Inc; 1988-02-24 to 1989-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Robinson-Phillips Coal Company Inc → Ace #64 Mine; 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