# Relationship history for MSHA mine 2100028

Current hierarchy: **Field Financial Corp → Field Granite International Ltd → Odessa Quarry**

- 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:** Cy  Zierden → Odessa Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delano Granite Inc → Odessa Quarry; 1980-12-01 to 1985-08-18; source msha-controller-operator-history
- **controller_controls_operator:** Cy  Zierden → Delano Granite Inc; 1980-12-01 to 1985-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Tony J  Morris  et al → Odessa Quarry; 1985-03-18 to 1986-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Georgia-Field Inc → Odessa Quarry; 1985-08-19 to 1986-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Tony J  Morris  et al → Georgia-Field Inc; 1985-08-19 to 1986-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Field Granite International Ltd → Odessa Quarry; 1986-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Field Financial Corp → Odessa Quarry; 1986-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Field Financial Corp → Field Granite International Ltd; 1986-10-15 to current/open; source msha-controller-operator-history