# Relationship history for MSHA mine 4407103

Current hierarchy: **Edsel H  Preece → Twin Ridge Development, Inc. → Big Branch**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Twin Ridge Development, Inc. → Big Branch; 2004-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edsel H  Preece et al → Big Branch; 2004-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edsel H  Preece et al → Twin Ridge Development, Inc.; 2004-07-22 to current/open; source msha-controller-operator-history