# Relationship history for MSHA mine 1509672

Current hierarchy: **Potter Gordon → Marathon Coal Corp → Potter Dock No 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Potter A C → Potter Dock No 2; 1975-06-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hampton Rhodes Coal Sales → Potter Dock No 2; 1976-03-01 to 1977-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Dennis & Garry A → Potter Dock No 2; 1976-03-01 to 1977-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Dennis & Garry A → Hampton Rhodes Coal Sales; 1976-03-01 to 1977-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Advance Fuel Company → Potter Dock No 2; 1977-07-22 to 1978-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Tim Doug  Johnson → Potter Dock No 2; 1977-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim Doug  Johnson → Advance Fuel Company; 1977-07-22 to 1978-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Cougar Fuel Inc → Potter Dock No 2; 1978-10-02 to 1982-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Potter A C → Cougar Fuel Inc; 1978-10-02 to 1982-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Potter Gordon → Potter Dock No 2; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Salyer et al → Potter Dock No 2; 1979-02-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mokie Coal Inc → Potter Dock No 2; 1982-06-17 to 1987-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Owens Paul B → Potter Dock No 2; 1982-06-17 to 1989-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Owens Paul B → Mokie Coal Inc; 1982-06-17 to 1987-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Eldorado Coal Company Inc → Potter Dock No 2; 1987-06-16 to 1991-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Salyer et al → Eldorado Coal Company Inc; 1987-06-16 to 1991-12-18; source msha-controller-operator-history
- **controller_controls_mine:** John M  Potter et al → Potter Dock No 2; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Longworth G Randall → Potter Dock No 2; 1991-09-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunny Ridge Mining Company Inc → Potter Dock No 2; 1991-12-19 to 1992-08-09; source msha-controller-operator-history
- **controller_controls_operator:** John M  Potter et al → Sunny Ridge Mining Company Inc; 1991-12-19 to 1992-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Potter et al → Sunny Ridge Mining Company Inc; 1991-12-19 to 1992-08-09; source msha-controller-operator-history
- **controller_controls_mine:** J O  Johnson → Potter Dock No 2; 1992-08-01 to 1994-05-01; source msha-controller-operator-history
- **operator_operates_mine:** L & J Coal Company Inc → Potter Dock No 2; 1992-08-10 to 1993-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Longworth G Randall → L & J Coal Company Inc; 1992-08-10 to 1993-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Corvette Mining Company Inc → Potter Dock No 2; 1993-02-05 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_operator:** J O  Johnson → Corvette Mining Company Inc; 1993-02-05 to 1994-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Marathon Coal Corp → Potter Dock No 2; 1994-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potter Gordon → Marathon Coal Corp; 1994-05-02 to current/open; source msha-controller-operator-history