# Relationship history for MSHA mine 2901458

Current hierarchy: **La Rue H N & Keith → H N La Rue & Sons → Smokey 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

- **operator_operates_mine:** H N La Rue & Sons → Smokey Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** La Rue H N & Keith → Smokey Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** La Rue H N & Keith → H N La Rue & Sons; 1950-01-01 to current/open; source msha-controller-operator-history