# Relationship history for MSHA mine 4607013

Current hierarchy: **Anderson Arthur L → Triple A Coals Inc → Surface #3**

- 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:** Anderson Arthur L → Surface #3; 1976-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple A Coals Inc → Surface #3; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Arthur L → Triple A Coals Inc; 1985-10-01 to current/open; source msha-controller-operator-history