# Relationship history for MSHA mine 4607858

Current hierarchy: **Joe D  Richards → Scorpio Mining Inc → Airport 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

- **controller_controls_mine:** Joe D  Richards → Airport Mine; 1989-07-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Scorpio Mining Inc → Airport Mine; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe D  Richards → Scorpio Mining Inc; 1990-03-01 to current/open; source msha-controller-operator-history