# Relationship history for MSHA mine 4601417

Current hierarchy: **Richard G  Preservati II → Mid-Vol Leasing Inc → Route 161 Air Shafts**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** United States Steel Mining Company Inc → Route 161 Air Shafts; 1950-01-01 to 1998-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Usx Corp → Route 161 Air Shafts; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Usx Corp → United States Steel Mining Company Inc; 1950-01-01 to 1998-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Richard G  Preservati II → Route 161 Air Shafts; 1992-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Vol Leasing Inc → Route 161 Air Shafts; 1998-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard G  Preservati II → Mid-Vol Leasing Inc; 1998-04-15 to current/open; source msha-controller-operator-history