# Relationship history for MSHA mine 3003201

Current hierarchy: **Kilmer Cecil → Cecil Kilmer Bluestone Quarries → OXFORD 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:** Kilmer Cecil → OXFORD QUARRY; 1987-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cecil Kilmer Bluestone Quarries → OXFORD QUARRY; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kilmer Cecil → Cecil Kilmer Bluestone Quarries; 1997-10-01 to current/open; source msha-controller-operator-history