# Relationship history for MSHA mine 0202130

Current hierarchy: **Foutz Sterling → Sterling Mining Company Inc → Miami Copper Operations**

- 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

- **controller_controls_mine:** L W Hardy Company Inc → Miami Copper Operations; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hardy Turquoise Company Inc → Miami Copper Operations; 1982-12-01 to 1987-06-08; source msha-controller-operator-history
- **controller_controls_operator:** L W Hardy Company Inc → Hardy Turquoise Company Inc; 1982-12-01 to 1987-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Sterling Mining Company Inc → Miami Copper Operations; 1987-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Foutz Sterling → Miami Copper Operations; 1987-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Foutz Sterling → Sterling Mining Company Inc; 1987-06-09 to current/open; source msha-controller-operator-history