# Relationship history for MSHA mine 3002822

Current hierarchy: **Walworth George → George Walworth → Gregory 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

- **operator_operates_mine:** Lawrence Gregory → Gregory Quarry; 1987-11-01 to 1989-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Gregory Lawrence → Gregory Quarry; 1987-11-01 to 1989-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Gregory Lawrence → Lawrence Gregory; 1987-11-01 to 1989-04-04; source msha-controller-operator-history
- **operator_operates_mine:** George Walworth → Gregory Quarry; 1989-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walworth George → Gregory Quarry; 1989-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walworth George → George Walworth; 1989-04-05 to current/open; source msha-controller-operator-history