# Relationship history for MSHA mine 4606690

Current hierarchy: **Rogers Olin D → Twin Action Mining Company Inc → No 1 Surface 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:** Epling Walter Ben & Michael R → No 1 Surface Mine; 1975-09-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E & M Coal Company Inc → No 1 Surface Mine; 1983-08-01 to 1984-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Epling Walter Ben & Michael R → E & M Coal Company Inc; 1983-08-01 to 1984-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Twin Action Mining Company Inc → No 1 Surface Mine; 1984-06-12 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Whitt Phillip D → No 1 Surface Mine; 1984-06-12 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Whitt Phillip D → Twin Action Mining Company Inc; 1984-06-12 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Twin Action Mining Company Inc → No 1 Surface Mine; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Olin D → No 1 Surface Mine; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Olin D → Twin Action Mining Company Inc; 1985-07-01 to current/open; source msha-controller-operator-history