# Relationship history for MSHA mine 4606791

Current hierarchy: **Bolen Aaron Doug → E & A Coal Company Inc → No 4 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Henry Dale  Shrewsbury → No 4 Mine; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E & A Coal Company → No 4 Mine; 1984-06-01 to 1988-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Henry Dale  Shrewsbury → E & A Coal Company; 1984-06-01 to 1988-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Bolen Aaron Doug → No 4 Mine; 1988-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mercer Mining Inc → No 4 Mine; 1988-05-01 to 1988-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Mc Kinney Herbert → No 4 Mine; 1988-05-01 to 1988-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kinney Herbert → Mercer Mining Inc; 1988-05-01 to 1988-08-10; source msha-controller-operator-history
- **operator_operates_mine:** E & A Coal Company Inc → No 4 Mine; 1988-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bolen Aaron Doug → E & A Coal Company Inc; 1988-08-11 to current/open; source msha-controller-operator-history