# Relationship history for MSHA mine 3609616

Current hierarchy: **Timothy M  Smith → Ronald Opeil Flagstone Co., LLC → Stephens Point 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Edward Cox Jr → Stephens Point Quarry; 2008-04-16 to 2016-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Edward M  Cox Jr → Stephens Point Quarry; 2008-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward M  Cox Jr → Edward Cox Jr; 2008-04-16 to 2016-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Timothy M  Smith → Stephens Point Quarry; 2016-03-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ronald Opeil Flagstone Co., LLC → Stephens Point Quarry; 2016-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy M  Smith → Ronald Opeil Flagstone Co., LLC; 2016-08-23 to current/open; source msha-controller-operator-history