# Relationship history for MSHA mine 1519039

Current hierarchy: **Hufford V  Williams → Williams Bros. Coal Co., Inc. → Coal Hollow 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Hufford V  Williams → Coal Hollow Mine; 1986-05-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Williams Bros. Coal Co., Inc. → Coal Hollow Mine; 2006-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hufford V  Williams → Williams Bros. Coal Co., Inc.; 2006-08-31 to current/open; source msha-controller-operator-history