# Relationship history for MSHA mine 1700817

Current hierarchy: **Donald A  DuBois → Downeast Quarries of Maine Incorporated → Downeast Quarries of Maine Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Downeast Quarries of Maine Incorporated → Downeast Quarries of Maine Incorporated; 2007-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald A  DuBois → Downeast Quarries of Maine Incorporated; 2007-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald A  DuBois → Downeast Quarries of Maine Incorporated; 2007-06-06 to current/open; source msha-controller-operator-history