# Relationship history for MSHA mine 1512581

Current hierarchy: **Paul E  Roberts → Hardwick Mining Company Inc → Rebecca #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

- **controller_controls_mine:** Hardwick William E → Rebecca #1; 1979-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hardwick Mining Corp → Rebecca #1; 1980-11-01 to 1985-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Hardwick William E → Hardwick Mining Corp; 1980-11-01 to 1985-02-24; source msha-controller-operator-history
- **operator_operates_mine:** Hardwick Mining Company Inc → Rebecca #1; 1985-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul E  Roberts et al → Rebecca #1; 1985-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul E  Roberts et al → Hardwick Mining Company Inc; 1985-02-25 to current/open; source msha-controller-operator-history