# Relationship history for MSHA mine 4602035

Current hierarchy: **Massey Energy Company → Rocky Hollow Coal Company → Mine No 2**

- 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:** Pond Creek Mining Company → Mine No 2; 1950-01-01 to 1987-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Sidney R  Young III → Mine No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sidney R  Young III → Pond Creek Mining Company; 1950-01-01 to 1987-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Hollow Coal Company → Mine No 2; 1987-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Mine No 2; 1987-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Rocky Hollow Coal Company; 1987-02-19 to current/open; source msha-controller-operator-history