# Relationship history for MSHA mine 4605537

Current hierarchy: **Warf Michael → Solid Fuels Inc → No 1**

- 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:** Bradman Coal Corp → No 1; 1976-12-01 to 1987-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Brown Roman → No 1; 1976-12-01 to 1987-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Brown Roman → Bradman Coal Corp; 1976-12-01 to 1987-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Solid Fuels Inc → No 1; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Warf Michael → No 1; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warf Michael → Solid Fuels Inc; 1987-05-01 to current/open; source msha-controller-operator-history