# Relationship history for MSHA mine 4202640

Current hierarchy: **Landon  Floyd; Blake  Demille → Coal Creek Gravel → Coal Creek 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Coal Creek Gravel → Coal Creek Gravel; 2014-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Landon  Floyd et al → Coal Creek Gravel; 2014-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Landon  Floyd et al → Coal Creek Gravel; 2014-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blake  Demille et al → Coal Creek Gravel; 2014-11-21 to current/open; source msha-controller-operator-history