# Relationship history for MSHA mine 4405686

Current hierarchy: **Blankenship Bobby R → Double B Mining Company 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

- **controller_controls_mine:** Bailey Arnold → No 1; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patrick Petroleum Corp Of Michigan → No 1; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Top Notch Coal Company Inc → No 1; 1981-07-01 to 1981-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Arnold → Top Notch Coal Company Inc; 1981-07-01 to 1981-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Patrick Coal Corp → No 1; 1981-12-03 to 1981-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Patrick Petroleum Corp Of Michigan → Patrick Coal Corp; 1981-12-03 to 1981-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Double B Mining Company Inc → No 1; 1981-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Bobby R → No 1; 1981-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Bobby R → Double B Mining Company Inc; 1981-12-29 to current/open; source msha-controller-operator-history