# Relationship history for MSHA mine 1800276

Current hierarchy: **Donald M  Wolf → Brandywine Enterprises Inc → BRANDYWINE 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:** Davidsonville Sand & Gravel Company Inc → BRANDYWINE SAND & GRAVEL; 1950-01-01 to 1980-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Harold D  Hunt → BRANDYWINE SAND & GRAVEL; 1950-01-01 to 1980-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Harold D  Hunt → Davidsonville Sand & Gravel Company Inc; 1950-01-01 to 1980-05-07; source msha-controller-operator-history
- **controller_controls_mine:** John W  Spivey et al → BRANDYWINE SAND & GRAVEL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brandywine Sand & Gravel Company → BRANDYWINE SAND & GRAVEL; 1980-05-08 to 1990-06-14; source msha-controller-operator-history
- **controller_controls_operator:** John W  Spivey et al → Brandywine Sand & Gravel Company; 1980-05-08 to 1990-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Peter L  Babb et al → Brandywine Sand & Gravel Company; 1980-05-08 to 1990-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Glendal  Harris et al → Brandywine Sand & Gravel Company; 1980-05-08 to 1990-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Brandywine Enterprises Inc → BRANDYWINE SAND & GRAVEL; 1990-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald M  Wolf → BRANDYWINE SAND & GRAVEL; 1990-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald M  Wolf → Brandywine Enterprises Inc; 1990-06-15 to current/open; source msha-controller-operator-history