# Relationship history for MSHA mine 3003183

Current hierarchy: **Peter D  Schipano; Louise Diane  Cosimeno Schipano → Preston Hill Gravel → Preston Hill Gravel**

- 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:** Preston Hill Gravel, Inc → Preston Hill Gravel; 1997-04-01 to 2025-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Nancy B  Williams et al → Preston Hill Gravel; 1997-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy B  Williams et al → Preston Hill Gravel, Inc; 1997-04-01 to 2025-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Philip G  Williams et al → Preston Hill Gravel, Inc; 1997-04-01 to 2025-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Preston Hill Gravel → Preston Hill Gravel; 2025-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Louise Diane  Cosimeno Schipano → Preston Hill Gravel; 2025-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louise Diane  Cosimeno Schipano → Preston Hill Gravel; 2025-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter D  Schipano → Preston Hill Gravel; 2025-02-05 to current/open; source msha-controller-operator-history