# Relationship history for MSHA mine 1511450

Current hierarchy: **David A  Jones → Riverway North Inc → Riverway North Dock (D)**

- 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

- **operator_operates_mine:** Global Energies → Riverway North Dock (D); 1978-07-01 to 1980-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Hamner Keith → Riverway North Dock (D); 1978-07-01 to 1980-08-18; source msha-controller-operator-history
- **controller_controls_operator:** Hamner Keith → Global Energies; 1978-07-01 to 1980-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Energy Dock → Riverway North Dock (D); 1980-08-19 to 1981-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Hamner Keith & Appalachian Energy Co → Riverway North Dock (D); 1980-08-19 to 1981-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Hamner Keith & Appalachian Energy Co → Appalachian Energy Dock; 1980-08-19 to 1981-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Riverway North Inc → Riverway North Dock (D); 1981-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David A  Jones → Riverway North Dock (D); 1981-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Jones → Riverway North Inc; 1981-08-25 to current/open; source msha-controller-operator-history