# Relationship history for MSHA mine 4605581

Current hierarchy: **Lovett Dean E → Dell Mining Company → E & J No 1 Surface**

- 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:** Cassella Coal Company → E & J No 1 Surface; 1977-06-01 to 1978-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Cassella Joseph → E & J No 1 Surface; 1977-06-01 to 1978-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Cassella Joseph → Cassella Coal Company; 1977-06-01 to 1978-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Kst Mining Company Inc → E & J No 1 Surface; 1978-05-15 to 1979-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Brooks William H → E & J No 1 Surface; 1978-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brooks William H → Kst Mining Company Inc; 1978-05-15 to 1979-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Dell Mining Company → E & J No 1 Surface; 1979-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lovett Dean E → E & J No 1 Surface; 1979-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lovett Dean E → Dell Mining Company; 1979-09-04 to current/open; source msha-controller-operator-history