# Relationship history for MSHA mine 3401360

Current hierarchy: **Wilson Clay → Alpine Construction Corp → Port Carl Albert**

- 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:** Wilson Clay → Port Carl Albert; 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alpine Construction Corp → Port Carl Albert; 1982-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Clay → Alpine Construction Corp; 1982-07-01 to current/open; source msha-controller-operator-history