# Relationship history for MSHA mine 1515102

Current hierarchy: **Callihan Scott-Clifford Graves → Cadcoal → Surface**

- 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:** Cadcoal → Surface; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Callihan Scott-Clifford Graves Et Al → Surface; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Callihan Scott-Clifford Graves Et Al → Cadcoal; 1985-02-01 to current/open; source msha-controller-operator-history