# Relationship history for MSHA mine 1700609

Current hierarchy: **Francis A  Cormier → Cormier Construction → Church 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:** Cormier Construction → Church Quarry; 1992-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Francis A  Cormier → Church Quarry; 1992-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francis A  Cormier → Cormier Construction; 1992-09-01 to current/open; source msha-controller-operator-history