# Relationship history for MSHA mine 1513574

Current hierarchy: **Hall John L → John Hall Construction → No 1 Surface 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:** Worlie Bates → No 1 Surface Mine; 1982-07-01 to 1983-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Bates Worlie → No 1 Surface Mine; 1982-07-01 to 1983-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Bates Worlie → Worlie Bates; 1982-07-01 to 1983-06-01; source msha-controller-operator-history
- **operator_operates_mine:** John Hall Construction → No 1 Surface Mine; 1983-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall John L → No 1 Surface Mine; 1983-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall John L → John Hall Construction; 1983-06-02 to current/open; source msha-controller-operator-history