# Relationship history for MSHA mine 0405263

Current hierarchy: **Don  Schull → G B Western Inc → GBW-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:** G B Western Inc → GBW-1; 1995-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don  Schull → GBW-1; 1995-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Schull → G B Western Inc; 1995-02-01 to current/open; source msha-controller-operator-history