# Relationship history for MSHA mine 2402610

Current hierarchy: **Marcus  Vacca → Vacca Stone → Marcus Vacca Fort Union**

- 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:** Marcus  Vacca → Marcus Vacca Fort Union; 2011-09-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marcus Vacca → Marcus Vacca Fort Union; 2011-12-21 to 2012-03-27; source msha-controller-operator-history
- **controller_controls_operator:** Marcus  Vacca → Marcus Vacca; 2011-12-21 to 2012-03-27; source msha-controller-operator-history
- **operator_operates_mine:** Vacca Stone → Marcus Vacca Fort Union; 2012-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marcus  Vacca → Marcus Vacca Fort Union; 2012-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcus  Vacca → Vacca Stone; 2012-03-28 to current/open; source msha-controller-operator-history