# Relationship history for MSHA mine 3607215

Current hierarchy: **Ratay Edward & Helen → D & F Coal → D & F Coal**

- 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:** D & F Coal → D & F Coal; 1981-09-01 to 1985-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Freeman Richard A & John A Morris → D & F Coal; 1981-09-01 to 1985-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Freeman Richard A & John A Morris → D & F Coal; 1981-09-01 to 1985-06-19; source msha-controller-operator-history
- **operator_operates_mine:** D & F Coal → D & F Coal; 1985-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ratay Edward & Helen → D & F Coal; 1985-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ratay Edward & Helen → D & F Coal; 1985-06-20 to current/open; source msha-controller-operator-history