# Relationship history for MSHA mine 4503168

Current hierarchy: **Higginbotham Earl → C & H Trucking & Construction Inc → C & H 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:** C & H Trucking & Construction Inc → C & H Pit; 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Higginbotham Earl → C & H Pit; 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Higginbotham Earl → C & H Trucking & Construction Inc; 1987-06-01 to current/open; source msha-controller-operator-history