# Relationship history for MSHA mine 4605140

Current hierarchy: **Coal Arbed → Huff Energy Inc → Huff Energy No 1 Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Huff Energy Inc → Huff Energy No 1 Mine; 1976-03-01 to 1977-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Barnette Josephine → Huff Energy No 1 Mine; 1976-03-01 to 1977-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Barnette Josephine → Huff Energy Inc; 1976-03-01 to 1977-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Huff Energy Inc → Huff Energy No 1 Mine; 1977-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coal Arbed → Huff Energy No 1 Mine; 1977-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Arbed → Huff Energy Inc; 1977-03-14 to current/open; source msha-controller-operator-history