# Relationship history for MSHA mine 3700195

Current hierarchy: **Arthur  Mercure III → Northern Site Contractors Inc → PORTABLE #1 PIONEER**

- 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:** Northern Site Contractors Inc → PORTABLE #1 PIONEER; 2000-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur  Mercure III → PORTABLE #1 PIONEER; 2000-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur  Mercure III → Northern Site Contractors Inc; 2000-12-19 to current/open; source msha-controller-operator-history