# Relationship history for MSHA mine 1506693

Current hierarchy: **Akers Kenneth → Julie Mining Co → 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

- **operator_operates_mine:** D & R Coal Company → No 1 Mine; 1950-01-01 to 1973-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Donald Ray  Tackett → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald Ray  Tackett → D & R Coal Company; 1950-01-01 to 1973-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Julie Mining Co → No 1 Mine; 1973-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Akers Kenneth → No 1 Mine; 1973-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Akers Kenneth → Julie Mining Co; 1973-06-02 to current/open; source msha-controller-operator-history