# Relationship history for MSHA mine 4503369

Current hierarchy: **Daniel M  Hayes; Nick P  Hayes → Hayes Sand & Gravel Llc → HAYES SAND & GRAVEL LLC**

- 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:** Hayes Sand & Gravel Llc → HAYES SAND & GRAVEL LLC; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel M  Hayes et al → HAYES SAND & GRAVEL LLC; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel M  Hayes et al → Hayes Sand & Gravel Llc; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick P  Hayes et al → Hayes Sand & Gravel Llc; 1997-09-01 to current/open; source msha-controller-operator-history