# Relationship history for MSHA mine 2302389

Current hierarchy: **Alan E  Wolfe → A E Wolfe Environmental Services → 87th St**

- 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:** A E Wolfe Environmental Services → 87th St; 2008-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alan E  Wolfe → 87th St; 2008-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan E  Wolfe → A E Wolfe Environmental Services; 2008-11-05 to current/open; source msha-controller-operator-history