# Relationship history for MSHA mine 1511953

Current hierarchy: **Blackburn Phillip & Nancye Yost Caudill → New East Coal Corp → Nancy Anne Tipple**

- 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:** Delta Energy Corp → Nancy Anne Tipple; 1979-06-01 to 1983-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Fossil Fuels Inc → Nancy Anne Tipple; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fossil Fuels Inc → Delta Energy Corp; 1979-06-01 to 1983-04-18; source msha-controller-operator-history
- **operator_operates_mine:** New East Coal Corp → Nancy Anne Tipple; 1983-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackburn Phillip & Nancye Yost Caudill → Nancy Anne Tipple; 1983-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackburn Phillip & Nancye Yost Caudill → New East Coal Corp; 1983-04-19 to current/open; source msha-controller-operator-history