# Relationship history for MSHA mine 4103388

Current hierarchy: **Lafarge S A → Bryco Inc → Brookshire Plant**

- 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

- **operator_operates_mine:** Bryco Inc → Brookshire Plant; 1986-03-01 to 1987-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Butler Industries → Brookshire Plant; 1986-03-01 to 1987-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Butler Industries → Bryco Inc; 1986-03-01 to 1987-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Bryco Inc → Brookshire Plant; 1987-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Brookshire Plant; 1987-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Bryco Inc; 1987-12-09 to current/open; source msha-controller-operator-history