# Relationship history for MSHA mine 0900062

Current hierarchy: **Mathews Eugene A → Mathews Granite Inc → Oglethorpe 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Di Rienzo Brothers Granite Company Inc → Oglethorpe Quarry; 1950-01-01 to 1985-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Di Rienzo Joseph → Oglethorpe Quarry; 1950-01-01 to 1985-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Di Rienzo Joseph → Di Rienzo Brothers Granite Company Inc; 1950-01-01 to 1985-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Mathews Granite Inc → Oglethorpe Quarry; 1985-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mathews Eugene A → Oglethorpe Quarry; 1985-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mathews Eugene A → Mathews Granite Inc; 1985-09-20 to current/open; source msha-controller-operator-history