# Relationship history for MSHA mine 1515078

Current hierarchy: **Delford B  Endicott → Sunrise Energy Corp → 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:** Sunrise Energy Corp → No 1; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Delford B  Endicott et al → No 1; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delford B  Endicott et al → Sunrise Energy Corp; 1985-02-01 to current/open; source msha-controller-operator-history