# Relationship history for MSHA mine 4406387

Current hierarchy: **Daniels Walter B → Tos-Aoh Coal Company Inc → No 2 Mine**

- 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:** Tos-Aoh Coal Company Inc → No 2 Mine; 1987-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniels Walter B Et Al → No 2 Mine; 1987-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniels Walter B Et Al → Tos-Aoh Coal Company Inc; 1987-07-01 to current/open; source msha-controller-operator-history