# Relationship history for MSHA mine 1507321

Current hierarchy: **Burns Lester → Mountain Pulaski Coal Corp → No 1 Strip**

- 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:** Mountain Pulaski Coal Corp → No 1 Strip; 1974-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burns Lester → No 1 Strip; 1974-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burns Lester → Mountain Pulaski Coal Corp; 1974-06-01 to current/open; source msha-controller-operator-history