# Relationship history for MSHA mine 0301422

Current hierarchy: **Webb Gordon → Arkansas Valley Coal Services → Arbuckle Port**

- 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:** Arkansas Valley Coal Services → Arbuckle Port; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Webb Gordon → Arbuckle Port; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Webb Gordon → Arkansas Valley Coal Services; 1978-12-01 to current/open; source msha-controller-operator-history