# Relationship history for MSHA mine 4405864

Current hierarchy: **Blair Roger-Fred O Dotson → Tenn Va Coal Company → #1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Tenn Va Coal Company → #1 Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blair Roger-Fred O Dotson Et Al → #1 Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blair Roger-Fred O Dotson Et Al → Tenn Va Coal Company; 1982-03-01 to current/open; source msha-controller-operator-history