# Relationship history for MSHA mine 1513216

Current hierarchy: **Barnett Gary & James Seals → Seals Excavation → No 1 Surface Mine (D)**

- 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:** Seals Excavation → No 1 Surface Mine (D); 1981-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barnett Gary & James Seals → No 1 Surface Mine (D); 1981-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barnett Gary & James Seals → Seals Excavation; 1981-11-01 to current/open; source msha-controller-operator-history