# Relationship history for MSHA mine 2301804

Current hierarchy: **Carter Billy Joe → Carter Trucking Company → Walton Pit**

- 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:** Carter Trucking Company → Walton Pit; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carter Billy Joe → Walton Pit; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carter Billy Joe → Carter Trucking Company; 1980-04-01 to current/open; source msha-controller-operator-history