# Relationship history for MSHA mine 3102135

Current hierarchy: **Timothy Kevin  Washburn → Appalachian Stone Company Inc → Carolina Rose 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Timothy Kevin  Washburn → Carolina Rose Quarry; 1993-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Stone Company Inc → Carolina Rose Quarry; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy Kevin  Washburn → Appalachian Stone Company Inc; 1999-01-01 to current/open; source msha-controller-operator-history