# Relationship history for MSHA mine 3000884

Current hierarchy: **Chad B  Soper → Cooke Sand & Gravel Inc → Cooke Sand & Gravel Inc**

- 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:** Cooke Sand & Gravel Inc → Cooke Sand & Gravel Inc; 1950-01-01 to 1980-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Concrete Products Inc → Cooke Sand & Gravel Inc; 1950-01-01 to 1980-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Concrete Products Inc → Cooke Sand & Gravel Inc; 1950-01-01 to 1980-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Cooke Sand & Gravel Inc → Cooke Sand & Gravel Inc; 1980-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chad B  Soper → Cooke Sand & Gravel Inc; 1980-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad B  Soper → Cooke Sand & Gravel Inc; 1980-04-24 to current/open; source msha-controller-operator-history