# Relationship history for MSHA mine 1513266

Current hierarchy: **Westerman Shannon → Thac-West Mining Inc → Joe B Smith No 2 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:** Lesgro Coal Company Inc → Joe B Smith No 2 Mine; 1981-12-01 to 1982-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Gross Caleb P → Joe B Smith No 2 Mine; 1981-12-01 to 1982-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Gross Caleb P → Lesgro Coal Company Inc; 1981-12-01 to 1982-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Thac-West Mining Inc → Joe B Smith No 2 Mine; 1982-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Westerman Shannon → Joe B Smith No 2 Mine; 1982-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westerman Shannon → Thac-West Mining Inc; 1982-04-21 to current/open; source msha-controller-operator-history