# Relationship history for MSHA mine 1517245

Current hierarchy: **Robert L  Rosencrans → Sturgeon Mining Inc → #1 Wash Plant**

- 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:** Robert L  Rosencrans et al → #1 Wash Plant; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Collins Construction Company Inc → #1 Wash Plant; 1992-06-01 to 1992-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Collins Kevin → #1 Wash Plant; 1992-06-01 to 1992-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Collins Kevin → Collins Construction Company Inc; 1992-06-01 to 1992-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Sturgeon Mining Inc → #1 Wash Plant; 1992-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Rosencrans et al → Sturgeon Mining Inc; 1992-11-24 to current/open; source msha-controller-operator-history