# Relationship history for MSHA mine 4403745

Current hierarchy: **Blankenship Ray → Bob'S Branch Coal Company Inc → No 8 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

- **controller_controls_mine:** Blankenship Ray → No 8 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deel Allene → No 8 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ivy Branch Coal Co Inc → No 8 Mine; 1974-01-01 to 1977-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Deel Allene → Ivy Branch Coal Co Inc; 1974-01-01 to 1977-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Bob'S Branch Coal Company Inc → No 8 Mine; 1977-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Ray → Bob'S Branch Coal Company Inc; 1977-06-22 to current/open; source msha-controller-operator-history