# Relationship history for MSHA mine 4606163

Current hierarchy: **Richard G  Preservati II → Preservati Construction Company Inc → Piedmont Strip 11-80**

- 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

- **controller_controls_mine:** Richard G  Preservati II → Piedmont Strip 11-80; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lilly I C → Piedmont Strip 11-80; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G & I Coal Company Inc → Piedmont Strip 11-80; 1980-05-01 to 1984-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Lilly I C → G & I Coal Company Inc; 1980-05-01 to 1984-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Preservati Construction Company Inc → Piedmont Strip 11-80; 1984-02-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard G  Preservati II → Preservati Construction Company Inc; 1984-02-29 to current/open; source msha-controller-operator-history