# Relationship history for MSHA mine 0405165

Current hierarchy: **James D  Hatler → Sierra Rock Products → Montezuma 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

- **controller_controls_mine:** James D  Hatler → Montezuma Sand & Gravel; 1980-06-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Table Mountain Sand & Gravel Products Inc → Montezuma Sand & Gravel; 1992-01-01 to 1998-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Rod  Fortin → Montezuma Sand & Gravel; 1992-01-01 to 1998-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Rod  Fortin → Table Mountain Sand & Gravel Products Inc; 1992-01-01 to 1998-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Montezuma Aggregates Inc → Montezuma Sand & Gravel; 1998-05-18 to 2004-04-30; source msha-controller-operator-history
- **controller_controls_mine:** William  Valentine → Montezuma Sand & Gravel; 1998-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Valentine → Montezuma Aggregates Inc; 1998-05-18 to 2004-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Rock Products → Montezuma Sand & Gravel; 2004-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D  Hatler → Sierra Rock Products; 2004-05-01 to current/open; source msha-controller-operator-history