# Relationship history for MSHA mine 1512727

Current hierarchy: **Collins Roy L & Bailus Brown → Brown & Collins Inc → No 2 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

- **controller_controls_mine:** Collins Roy L & Bailus Brown → No 2 Strip; 1980-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brown & Collins Inc → No 2 Strip; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Roy L & Bailus Brown → Brown & Collins Inc; 1981-02-01 to current/open; source msha-controller-operator-history