# Relationship history for MSHA mine 3610397

Current hierarchy: **William E  Corson → Contract Crushing / Construction Inc → METSO LT1213 S/N 72819**

- 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:** William E  Corson → METSO LT1213 S/N 72819; 2004-08-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Contract Crushing / Construction Inc → METSO LT1213 S/N 72819; 2022-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Corson → Contract Crushing / Construction Inc; 2022-05-16 to current/open; source msha-controller-operator-history