# Relationship history for MSHA mine 0102480

Current hierarchy: **Cox Robert M → Cox Company → Dogwood 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

- **operator_operates_mine:** Cox Company → Dogwood Mine; 1982-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cox Robert M → Dogwood Mine; 1982-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cox Robert M → Cox Company; 1982-05-01 to current/open; source msha-controller-operator-history