# Relationship history for MSHA mine 1515354

Current hierarchy: **Behr Max M → Kentucky Sand & Gravel → Kentucky 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:** Meade County Sand & Gravel Company Inc → Kentucky Sand & Gravel; 1985-09-01 to 1986-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Lewis Paul → Kentucky Sand & Gravel; 1985-09-01 to 1986-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Lewis Paul → Meade County Sand & Gravel Company Inc; 1985-09-01 to 1986-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Meade County Sand & Gravel Company Inc → Kentucky Sand & Gravel; 1986-01-10 to 1988-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Cowley Harold E → Kentucky Sand & Gravel; 1986-01-10 to 1988-03-10; source msha-controller-operator-history
- **controller_controls_operator:** Cowley Harold E → Meade County Sand & Gravel Company Inc; 1986-01-10 to 1988-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Sand & Gravel → Kentucky Sand & Gravel; 1988-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Behr Max M → Kentucky Sand & Gravel; 1988-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Behr Max M → Kentucky Sand & Gravel; 1988-03-11 to current/open; source msha-controller-operator-history