# Relationship history for MSHA mine 1507315

Current hierarchy: **Harold E  Akers; Jim D  Akers → A A & W Coals Inc → No 12 (D)**

- 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:** Harold E  Akers et al → No 12 (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Anderson & Hunt Coal Company → No 12 (D); 1974-09-01 to 1981-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Howard & Troy Hunt → No 12 (D); 1974-09-01 to 1981-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Howard & Troy Hunt → Anderson & Hunt Coal Company; 1974-09-01 to 1981-04-12; source msha-controller-operator-history
- **operator_operates_mine:** Chilton Coal Corp → No 12 (D); 1981-04-13 to 1983-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Hunt James E → No 12 (D); 1981-04-13 to 1983-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Hunt James E → Chilton Coal Corp; 1981-04-13 to 1983-12-04; source msha-controller-operator-history
- **operator_operates_mine:** A A & W Coals Inc → No 12 (D); 1983-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Akers et al → A A & W Coals Inc; 1983-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim D  Akers et al → A A & W Coals Inc; 1983-12-05 to current/open; source msha-controller-operator-history