# Relationship history for MSHA mine 4405138

Current hierarchy: **Blanton Melvin → J & J Coal Sales → J & J Dock**

- 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:** J & J Coal Sales → J & J Dock; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blanton Melvin → J & J Dock; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blanton Melvin → J & J Coal Sales; 1978-12-01 to current/open; source msha-controller-operator-history