# Relationship history for MSHA mine 1509924

Current hierarchy: **Beddow James A & Edna Ruth → Circle B Coal Company → Hawesville Pit**

- 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:** Beddow James A & Edna Ruth Et Al → Hawesville Pit; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Circle B Coal Company → Hawesville Pit; 1976-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beddow James A & Edna Ruth Et Al → Circle B Coal Company; 1976-07-01 to current/open; source msha-controller-operator-history