# Relationship history for MSHA mine 3609076

Current hierarchy: **Diego G Vasquez → DG-Stone Supply LLC → Williams Stone**

- 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

- **operator_operates_mine:** J.D.W. Stone Quarry → Williams Stone; 2002-04-25 to 2023-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey D  Williams → Williams Stone; 2002-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey D  Williams → J.D.W. Stone Quarry; 2002-04-25 to 2023-08-30; source msha-controller-operator-history
- **operator_operates_mine:** DG-Stone Supply LLC → Williams Stone; 2023-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Diego G Vasquez → Williams Stone; 2023-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Diego G Vasquez → DG-Stone Supply LLC; 2023-08-31 to current/open; source msha-controller-operator-history