# Relationship history for MSHA mine 2901973

Current hierarchy: **Welshiemer C R (Bob) → American Construction → Bennie 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:** Welshiemer C R (Bob) → Bennie Mine; 1983-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Construction → Bennie Mine; 1984-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Welshiemer C R (Bob) → American Construction; 1984-09-01 to current/open; source msha-controller-operator-history