# Relationship history for MSHA mine 1508017

Current hierarchy: **Hurd James → W S H Construction Company Inc → No 2 Surface 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hurd James → No 2 Surface Mine; 1974-04-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W S H Construction Company Inc → No 2 Surface Mine; 1975-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hurd James → W S H Construction Company Inc; 1975-01-08 to current/open; source msha-controller-operator-history