# Relationship history for MSHA mine 4503741

Current hierarchy: **Eben  Twaddle → Interwest Construction, Inc. → Elwah 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:** Interwest Construction, Inc. → Elwah Pit; 2016-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eben  Twaddle → Elwah Pit; 2016-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eben  Twaddle → Interwest Construction, Inc.; 2016-01-20 to current/open; source msha-controller-operator-history