# Relationship history for MSHA mine 4703993

Current hierarchy: **Darrin C Senn → Twin City Material → Nelson 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Twin City Material → Nelson Pit; 2026-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darrin C Senn → Nelson Pit; 2026-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrin C Senn → Twin City Material; 2026-04-14 to current/open; source msha-controller-operator-history