# Relationship history for MSHA mine 4605755

Current hierarchy: **Sorbello Charles J → Washed Fossil Fuels Inc → Washed Fossil Fuels Inc**

- 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:** Farmington Coal Company → Washed Fossil Fuels Inc; 1977-12-01 to 1985-09-02; source msha-controller-operator-history
- **controller_controls_mine:** Farmington Coal Corp → Washed Fossil Fuels Inc; 1977-12-01 to 1985-09-02; source msha-controller-operator-history
- **controller_controls_operator:** Farmington Coal Corp → Farmington Coal Company; 1977-12-01 to 1985-09-02; source msha-controller-operator-history
- **operator_operates_mine:** Washed Fossil Fuels Inc → Washed Fossil Fuels Inc; 1985-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sorbello Charles J → Washed Fossil Fuels Inc; 1985-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sorbello Charles J → Washed Fossil Fuels Inc; 1985-09-03 to current/open; source msha-controller-operator-history