# Relationship history for MSHA mine 0203480

Current hierarchy: **Marisol A Kelland → Gutierrez Canales Engineering, PC → GCE Blaisdell Mine**

- 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:** Gutierrez Canales Engineering, PC → GCE Blaisdell Mine; 2023-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marisol A Kelland → GCE Blaisdell Mine; 2023-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marisol A Kelland → Gutierrez Canales Engineering, PC; 2023-07-10 to current/open; source msha-controller-operator-history