# Relationship history for MSHA mine 4607907

Current hierarchy: **Florida Progress Corporation → Kanawha River Terminals Inc → Ceredo Ponds**

- 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:** Oglebay Norton Company → Ceredo Ponds; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Florida Progress Corporation → Ceredo Ponds; 1990-01-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cmi Recycling Of West Virginia Inc → Ceredo Ponds; 1990-06-01 to 1994-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Coal Management Inc → Ceredo Ponds; 1990-06-01 to 1994-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Coal Management Inc → Cmi Recycling Of West Virginia Inc; 1990-06-01 to 1994-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Oglebay Norton Company → Ceredo Ponds; 1994-03-01 to 1994-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Oglebay Norton Company → Oglebay Norton Company; 1994-03-01 to 1994-08-23; source msha-controller-operator-history
- **operator_operates_mine:** Kanawha River Terminals Inc → Ceredo Ponds; 1994-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Kanawha River Terminals Inc; 1994-08-24 to current/open; source msha-controller-operator-history