# Relationship history for MSHA mine 0202754

Current hierarchy: **Lon  A  Thomas → Star Stone Quarries → Crookton 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:** Lon  A  Thomas → Crookton Quarry; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Star Stone Quarries → Crookton Quarry; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lon  A  Thomas → Star Stone Quarries; 1998-03-01 to current/open; source msha-controller-operator-history