# Relationship history for MSHA mine 2800924

Current hierarchy: **George Wimpey Plc → Tri County Asphalt Corp → Wallkill Valley Aggregates**

- 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:** Ted Hessler Sand & Gravel → Wallkill Valley Aggregates; 1950-01-01 to 1981-05-26; source msha-controller-operator-history
- **controller_controls_mine:** Hessler Ted → Wallkill Valley Aggregates; 1950-01-01 to 1981-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Hessler Ted → Ted Hessler Sand & Gravel; 1950-01-01 to 1981-05-26; source msha-controller-operator-history
- **controller_controls_mine:** George T  Tucker → Wallkill Valley Aggregates; 1950-01-01 to 1989-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Tri County Asphalt Corp → Wallkill Valley Aggregates; 1981-05-27 to 1989-11-01; source msha-controller-operator-history
- **controller_controls_operator:** George T  Tucker → Tri County Asphalt Corp; 1981-05-27 to 1989-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Tri County Asphalt Corp → Wallkill Valley Aggregates; 1989-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George Wimpey Plc → Wallkill Valley Aggregates; 1989-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George Wimpey Plc → Tri County Asphalt Corp; 1989-11-02 to current/open; source msha-controller-operator-history