# Relationship history for MSHA mine 4002746

Current hierarchy: **Dupre Gail F → Alpha B M B Energy Inc → Alpha No 2 Ug**

- 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:** Dupre Gail F → Alpha No 2 Ug; 1980-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alpha B M B Energy Inc → Alpha No 2 Ug; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dupre Gail F → Alpha B M B Energy Inc; 1981-09-01 to current/open; source msha-controller-operator-history