# Relationship history for MSHA mine 4405467

Current hierarchy: **O'Quinn Franklin D R & Wilburn Blankenship → Black Hollow 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

- **controller_controls_mine:** O'Quinn Franklin D R & Wilburn Blankenship Et Al → No 2 Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Hollow Coal Company Inc → No 2 Mine; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** O'Quinn Franklin D R & Wilburn Blankenship Et Al → Black Hollow Coal Company Inc; 1980-07-01 to current/open; source msha-controller-operator-history