# Relationship history for MSHA mine 3002534

Current hierarchy: **Cerretani Ralph → Corbisello Quarries Inc → Boland-Thompson Tract**

- 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

- **controller_controls_mine:** Cerretani Ralph → Boland-Thompson Tract; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B F W Sand & Gravel Corp → Boland-Thompson Tract; 1980-07-01 to 1981-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Boland James → Boland-Thompson Tract; 1980-07-01 to 1981-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Boland James → B F W Sand & Gravel Corp; 1980-07-01 to 1981-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Corbisello Quarries Inc → Boland-Thompson Tract; 1981-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cerretani Ralph → Corbisello Quarries Inc; 1981-07-17 to current/open; source msha-controller-operator-history