# Relationship history for MSHA mine 1513226

Current hierarchy: **Clark Greg → Runnin Coal Inc → 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:** Lone Oak Mining Inc → No 1 Mine; 1981-11-01 to 1983-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Salisbury David → No 1 Mine; 1981-11-01 to 1983-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Salisbury David → Lone Oak Mining Inc; 1981-11-01 to 1983-08-09; source msha-controller-operator-history
- **operator_operates_mine:** Runnin Coal Inc → No 1 Mine; 1983-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clark Greg → No 1 Mine; 1983-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clark Greg → Runnin Coal Inc; 1983-08-10 to current/open; source msha-controller-operator-history