# Relationship history for MSHA mine 3800028

Current hierarchy: **Boral Limited → Boral Bricks Inc → Van Wyck Mines**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Boral Limited → Van Wyck Mines; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ashe Brick Company → Van Wyck Mines; 1950-01-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Ashe Brick Company → Van Wyck Mines; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashe Brick Company → Ashe Brick Company; 1950-01-01 to 1986-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Boral Bricks Inc → Van Wyck Mines; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boral Limited → Boral Bricks Inc; 1986-05-01 to current/open; source msha-controller-operator-history