# Relationship history for MSHA mine 4406072

Current hierarchy: **Sullivan Dan G-Delmer Vencill → Benchmark Mining Company Inc → Benchmark 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

- **controller_controls_mine:** Sullivan Dan G-Delmer Vencill Et Al → Benchmark Mine; 1981-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Benchmark Mining Company Inc → Benchmark Mine; 1984-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sullivan Dan G-Delmer Vencill Et Al → Benchmark Mining Company Inc; 1984-03-01 to current/open; source msha-controller-operator-history