# Relationship history for MSHA mine 2700219

Current hierarchy: **Marcel C  Nadeau → J & M Lumber & Construction Inc → BERLIN SAND AND GRAVEL PIT & PLANT**

- 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:** J & M Lumber & Construction Inc → BERLIN SAND AND GRAVEL PIT & PLANT; 1978-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marcel C  Nadeau → BERLIN SAND AND GRAVEL PIT & PLANT; 1978-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcel C  Nadeau → J & M Lumber & Construction Inc; 1978-12-31 to current/open; source msha-controller-operator-history