# Relationship history for MSHA mine 3700096

Current hierarchy: **Charles D  Anthony → Mar-Al Enterprises Inc → Coventry 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:** General Road Trucking Corp → Coventry Sand & Gravel; 1950-01-01 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Joseph D  Anthony → Coventry Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph D  Anthony → General Road Trucking Corp; 1950-01-01 to 2005-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Mar-Al Enterprises Inc → Coventry Sand & Gravel; 2006-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles D  Anthony → Coventry Sand & Gravel; 2006-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Anthony → Mar-Al Enterprises Inc; 2006-01-01 to current/open; source msha-controller-operator-history