# Relationship history for MSHA mine 3604361

Current hierarchy: **Deborah A  Will → West Greene Sand & Gravel-Div/Afton Trucking Inc → WEST GREENE SAND & 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Ganzer Sand & Gravel Inc → WEST GREENE SAND & GRAVEL; 1950-01-01 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Josephine M  Ganzer → WEST GREENE SAND & GRAVEL; 1950-01-01 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Josephine M  Ganzer → Ganzer Sand & Gravel Inc; 1950-01-01 to 1994-05-01; source msha-controller-operator-history
- **operator_operates_mine:** West Greene Sand & Gravel-Div/Afton Trucking Inc → WEST GREENE SAND & GRAVEL; 1994-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deborah A  Will → WEST GREENE SAND & GRAVEL; 1994-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deborah A  Will → West Greene Sand & Gravel-Div/Afton Trucking Inc; 1994-05-02 to current/open; source msha-controller-operator-history