# Relationship history for MSHA mine 3102096

Current hierarchy: **Timothy Kevin  Washburn → Appalachian Stone Company → NO 1 MINE**

- 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:** Appalachian Stone Company → NO 1 MINE; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy Kevin  Washburn → NO 1 MINE; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy Kevin  Washburn → Appalachian Stone Company; 1993-06-01 to current/open; source msha-controller-operator-history