# Relationship history for MSHA mine 3003763

Current hierarchy: **Arna  Herman → Wyco Construction Inc. → Wyco Pit**

- 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:** Wyco Construction Inc. → Wyco Pit; 2010-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arna  Herman et al → Wyco Pit; 2010-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arna  Herman et al → Wyco Construction Inc.; 2010-05-27 to current/open; source msha-controller-operator-history