# Relationship history for MSHA mine 4104792

Current hierarchy: **James E  Welch; Evelyn  Welch → Liberty Materials Inc. → Liberty Materials Moss Hill Plant**

- 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

- **controller_controls_mine:** James E  Welch et al → Liberty Materials Moss Hill Plant; 1989-12-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Liberty Materials Inc. → Liberty Materials Moss Hill Plant; 2009-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James E  Welch et al → Liberty Materials Inc.; 2009-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evelyn  Welch et al → Liberty Materials Inc.; 2009-07-20 to current/open; source msha-controller-operator-history