# Relationship history for MSHA mine 4604372

Current hierarchy: **Occidental Petroleum Corp → Island Creek Coal Company → Verner Coal Ramp**

- 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 → Verner Coal Ramp; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peach Creek Processing Company → Verner Coal Ramp; 1974-01-01 to 1982-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Kelly John A → Verner Coal Ramp; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly John A → Peach Creek Processing Company; 1974-01-01 to 1982-01-06; source msha-controller-operator-history
- **operator_operates_mine:** Island Creek Coal Company → Verner Coal Ramp; 1982-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Island Creek Coal Company; 1982-01-07 to current/open; source msha-controller-operator-history