# Relationship history for MSHA mine 3003497

Current hierarchy: **Jeffrey L  Gaylord; Carmi  Rapport → Gaylord Sand & Gravel → Turbo Chiefton 800**

- 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:** Gaylord Sand & Gravel → Turbo Chiefton 800; 2005-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey L  Gaylord et al → Turbo Chiefton 800; 2005-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey L  Gaylord et al → Gaylord Sand & Gravel; 2005-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmi  Rapport et al → Gaylord Sand & Gravel; 2005-05-12 to current/open; source msha-controller-operator-history