# Relationship history for MSHA mine 0301372

Current hierarchy: **Hobbs Arlon → Hobbs Contractor Inc → Malvern 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:** Clyde Vaughn Trucking → Malvern Pit; 1950-01-01 to 1978-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Vaughn Clyde Trucking → Malvern Pit; 1950-01-01 to 1978-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Vaughn Clyde Trucking → Clyde Vaughn Trucking; 1950-01-01 to 1978-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Hobbs Contractor Inc → Malvern Pit; 1978-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hobbs Arlon → Malvern Pit; 1978-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hobbs Arlon → Hobbs Contractor Inc; 1978-06-21 to current/open; source msha-controller-operator-history