# Relationship history for MSHA mine 0600672

Current hierarchy: **Paul E  Martilla → Bay Mountain Contracting Inc → BAY MOUNTAIN**

- 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:** Bay Mountain Contracting Inc → BAY MOUNTAIN; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul E  Martilla → BAY MOUNTAIN; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul E  Martilla → Bay Mountain Contracting Inc; 1999-07-01 to current/open; source msha-controller-operator-history