# Relationship history for MSHA mine 1519745

Current hierarchy: **Michael A  Walker → MWR LLC → Face Up No. 1**

- 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:** MWR LLC → Face Up No. 1; 2014-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael A  Walker → Face Up No. 1; 2014-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Walker → MWR LLC; 2014-04-24 to current/open; source msha-controller-operator-history