# Relationship history for MSHA mine 4406575

Current hierarchy: **Richard L  Turner; Henry  Morgan → F C R Sand & Gravel Company Inc → F C R Sand & 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:** F C R Sand & Gravel Company Inc → F C R Sand & Gravel; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henry  Morgan et al → F C R Sand & Gravel; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry  Morgan et al → F C R Sand & Gravel Company Inc; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Turner et al → F C R Sand & Gravel Company Inc; 1990-04-01 to current/open; source msha-controller-operator-history