# Relationship history for MSHA mine 3609479

Current hierarchy: **Alvin J  Roman → No. 1 Contracting Corp. → Eckley South**

- 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

- **controller_controls_mine:** Alvin J  Roman → Eckley South; 1996-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** No. 1 Contracting Corp. → Eckley South; 2006-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alvin J  Roman → No. 1 Contracting Corp.; 2006-11-01 to current/open; source msha-controller-operator-history