# Relationship history for MSHA mine 3606980

Current hierarchy: **David P  Hoobler → H & H Materials Inc → HUTCHESON PIT & 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

- **operator_operates_mine:** H & H Materials Inc → HUTCHESON PIT & PLANT; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David P  Hoobler → HUTCHESON PIT & PLANT; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David P  Hoobler → H & H Materials Inc; 1980-04-01 to current/open; source msha-controller-operator-history