# Relationship history for MSHA mine 0202151

Current hierarchy: **Baker Fred → Alpine Partners Inc → Button 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:** Alpine Partners Inc → Button Mine; 1983-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Baker Fred → Button Mine; 1983-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baker Fred → Alpine Partners Inc; 1983-05-01 to current/open; source msha-controller-operator-history