# Relationship history for MSHA mine 1511652

Current hierarchy: **Ball Ralph → Sterling Energy Inc → Ely Hollow Deep 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

- **operator_operates_mine:** Warren Coal Company → Ely Hollow Deep Mine; 1978-11-01 to 1980-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Warren Mount → Ely Hollow Deep Mine; 1978-11-01 to 1980-04-13; source msha-controller-operator-history
- **controller_controls_operator:** Warren Mount → Warren Coal Company; 1978-11-01 to 1980-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Swanton Corp → Ely Hollow Deep Mine; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kenerco Corp → Ely Hollow Deep Mine; 1980-04-14 to 1981-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Swanton Corp → Kenerco Corp; 1980-04-14 to 1981-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Sterling Energy Inc → Ely Hollow Deep Mine; 1981-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ball Ralph → Ely Hollow Deep Mine; 1981-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ball Ralph → Sterling Energy Inc; 1981-06-24 to current/open; source msha-controller-operator-history