# Relationship history for MSHA mine 1508670

Current hierarchy: **Ratliff Gary D → Greg Coal Company → No 1 Mine**

- 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:** Dunavant Enterprises Inc → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D R T Coal Company Inc → No 1 Mine; 1975-01-01 to 1975-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Dunavant Enterprises Inc → D R T Coal Company Inc; 1975-01-01 to 1975-12-01; source msha-controller-operator-history
- **operator_operates_mine:** A & S Mining Company → No 1 Mine; 1975-12-02 to 1976-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Austin Charles R & Jerry Gabell → No 1 Mine; 1975-12-02 to 1976-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Austin Charles R & Jerry Gabell → A & S Mining Company; 1975-12-02 to 1976-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Joanne Coal Company → No 1 Mine; 1976-02-10 to 1976-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Austin Joanne → No 1 Mine; 1976-02-10 to 1976-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Austin Joanne → Joanne Coal Company; 1976-02-10 to 1976-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Greg Coal Company → No 1 Mine; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Gary D → No 1 Mine; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Gary D → Greg Coal Company; 1976-06-01 to current/open; source msha-controller-operator-history