# Relationship history for MSHA mine 4605712

Current hierarchy: **Blair John → John Roger Mining 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:** Cook & Workman Mining Company Inc → No 1; 1978-02-01 to 1982-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Workman Lovell D → No 1; 1978-02-01 to 1982-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Workman Lovell D → Cook & Workman Mining Company Inc; 1978-02-01 to 1982-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Duncan Coal Corp → No 1; 1982-06-15 to 1983-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Whitten Lindsey → No 1; 1982-06-15 to 1984-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Whitten Lindsey → Duncan Coal Corp; 1982-06-15 to 1983-07-05; source msha-controller-operator-history
- **operator_operates_mine:** John Roger Mining Inc → No 1; 1983-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blair John → No 1; 1983-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blair John → John Roger Mining Inc; 1983-07-06 to current/open; source msha-controller-operator-history