# Relationship history for MSHA mine 0302081

Current hierarchy: **E D Ward Inc; Michael  Wardlow → Rock Island Sand & Gravel LLC → Rock Island 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Rock Island Sand & Gravel LLC → Rock Island Sand & Gravel LLC; 2022-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Wardlow et al → Rock Island Sand & Gravel LLC; 2022-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Wardlow et al → Rock Island Sand & Gravel LLC; 2022-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E D Ward Inc et al → Rock Island Sand & Gravel LLC; 2022-04-11 to current/open; source msha-controller-operator-history