# Relationship history for MSHA mine 4608292

Current hierarchy: **Occidental Petroleum Corp → Laurel Run Mining Company → Spring Branch No 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:** Occidental Petroleum Corp → Spring Branch No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Run Mining Company → Spring Branch No 1; 1993-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Laurel Run Mining Company; 1993-03-01 to current/open; source msha-controller-operator-history