# Relationship history for MSHA mine 3609629

Current hierarchy: **August F  DeLuca → Rock Ridge Stone → Wonderland Quarry**

- 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:** Edward M  Cox Jr → Wonderland Quarry; 2008-04-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Edward Cox Jr → Wonderland Quarry; 2008-05-21 to 2016-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Edward M  Cox Jr → Edward Cox Jr; 2008-05-21 to 2016-10-17; source msha-controller-operator-history
- **controller_controls_mine:** August F  DeLuca → Wonderland Quarry; 2015-06-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rock Ridge Stone → Wonderland Quarry; 2016-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** August F  DeLuca → Rock Ridge Stone; 2016-10-18 to current/open; source msha-controller-operator-history