# Relationship history for MSHA mine 1601023

Current hierarchy: **Alvin V  Davis → Davis Sand & Gravel Inc → Davis 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:** Joshlin'S Sand & Gravel → Davis Sand & Gravel Inc; 1982-05-01 to 1995-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Darrel  Joshlin → Davis Sand & Gravel Inc; 1982-05-01 to 1995-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Darrel  Joshlin → Joshlin'S Sand & Gravel; 1982-05-01 to 1995-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Davis Sand & Gravel Inc → Davis Sand & Gravel Inc; 1995-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alvin V  Davis → Davis Sand & Gravel Inc; 1995-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alvin V  Davis → Davis Sand & Gravel Inc; 1995-08-02 to current/open; source msha-controller-operator-history