# Relationship history for MSHA mine 5002051

Current hierarchy: **Scott W Hessinger; Matthew P Ketchum → K & H Civil Constructors, LLC → S. Clapp Gravel**

- 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:** K & H Civil Constructors, LLC → S. Clapp Gravel; 2017-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew P Ketchum et al → S. Clapp Gravel; 2017-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew P Ketchum et al → K & H Civil Constructors, LLC; 2017-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott W Hessinger et al → K & H Civil Constructors, LLC; 2017-03-01 to current/open; source msha-controller-operator-history