# Relationship history for MSHA mine 0501589

Current hierarchy: **Watson Tom & Mike Guffey → Western Earth Movers → Old River Mill**

- 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:** L & M Oro Ii Inc → Old River Mill; 1950-01-01 to 1990-05-09; source msha-controller-operator-history
- **controller_controls_mine:** L & M Oro Ii Inc → Old River Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L & M Oro Ii Inc → L & M Oro Ii Inc; 1950-01-01 to 1990-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Western Earth Movers → Old River Mill; 1990-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Watson Tom & Mike Guffey → Old River Mill; 1990-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Watson Tom & Mike Guffey → Western Earth Movers; 1990-05-10 to current/open; source msha-controller-operator-history