# Relationship history for MSHA mine 0301915

Current hierarchy: **Charles R  Tankersley → Cobar Construction Inc → Eldridge Ranch Proj**

- 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:** Cobar Construction Inc → Eldridge Ranch Proj; 2005-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles R  Tankersley → Eldridge Ranch Proj; 2005-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles R  Tankersley → Cobar Construction Inc; 2005-07-06 to current/open; source msha-controller-operator-history