# Relationship history for MSHA mine 1512851

Current hierarchy: **Pennington Calvin → Hubbs Creek Coal → Hubbs Creek Coal No 5**

- 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:** Ivy Energy Corp → Hubbs Creek Coal No 5; 1981-04-01 to 1983-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Sidney Et Al → Hubbs Creek Coal No 5; 1981-04-01 to 1983-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Sidney Et Al → Ivy Energy Corp; 1981-04-01 to 1983-01-03; source msha-controller-operator-history
- **operator_operates_mine:** Sylvia Anne Coal Company → Hubbs Creek Coal No 5; 1983-01-04 to 1988-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Donahoe Clifford → Hubbs Creek Coal No 5; 1983-01-04 to 1988-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Donahoe Clifford → Sylvia Anne Coal Company; 1983-01-04 to 1988-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Pennington Calvin → Hubbs Creek Coal No 5; 1983-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hubbs Creek Coal → Hubbs Creek Coal No 5; 1988-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pennington Calvin → Hubbs Creek Coal; 1988-05-26 to current/open; source msha-controller-operator-history