# Relationship history for MSHA mine 4601398

Current hierarchy: **Massey Energy Company → Shannon-Pocahontas Mining Company → Shannon Branch Mine**

- 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:** Vera Mining Company → Shannon Branch Mine; 1950-01-01 to 1980-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Allied Chemical Corp → Shannon Branch Mine; 1950-01-01 to 1980-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Allied Chemical Corp → Vera Mining Company; 1950-01-01 to 1980-03-09; source msha-controller-operator-history
- **operator_operates_mine:** Shannon-Pocahontas Mining Company → Shannon Branch Mine; 1980-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Shannon Branch Mine; 1980-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Shannon-Pocahontas Mining Company; 1980-03-10 to current/open; source msha-controller-operator-history