# Relationship history for MSHA mine 3607204

Current hierarchy: **Stauffer Curtis D → Negley Recovery Corp → Cherry Valley Refuse**

- 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

- **operator_operates_mine:** Empire Fuel Corp → Cherry Valley Refuse; 1981-09-01 to 1983-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Johnston John → Cherry Valley Refuse; 1981-09-01 to 1983-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Johnston John → Empire Fuel Corp; 1981-09-01 to 1983-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Empire Fuel Corp → Cherry Valley Refuse; 1983-06-14 to 1987-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Rygel Joseph R → Cherry Valley Refuse; 1983-06-14 to 1993-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Rygel Joseph R → Empire Fuel Corp; 1983-06-14 to 1987-03-23; source msha-controller-operator-history
- **operator_operates_mine:** Key Coal Company → Cherry Valley Refuse; 1987-03-24 to 1990-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Rainaldi Al-William G Stewart Et Al → Cherry Valley Refuse; 1987-03-24 to 1990-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Rainaldi Al-William G Stewart Et Al → Key Coal Company; 1987-03-24 to 1990-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Empire Fuel Corp → Cherry Valley Refuse; 1990-11-30 to 1993-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Rygel Joseph R → Empire Fuel Corp; 1990-11-30 to 1993-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Stauffer Curtis D → Cherry Valley Refuse; 1992-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Negley Recovery Corp → Cherry Valley Refuse; 1993-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stauffer Curtis D → Negley Recovery Corp; 1993-01-11 to current/open; source msha-controller-operator-history