# Relationship history for MSHA mine 0202256

Current hierarchy: **Al  Bader → B & B Materials → B&B MATERIALS**

- 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:** B & B Materials → B&B MATERIALS; 1985-06-01 to 1987-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Gene W  Bennett → B&B MATERIALS; 1985-06-01 to 1987-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Gene W  Bennett → B & B Materials; 1985-06-01 to 1987-11-13; source msha-controller-operator-history
- **operator_operates_mine:** B & B Materials → B&B MATERIALS; 1987-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Al  Bader → B&B MATERIALS; 1987-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Al  Bader → B & B Materials; 1987-11-14 to current/open; source msha-controller-operator-history