# Relationship history for MSHA mine 2700376

Current hierarchy: **Samuel O  Mick → MICK CONSTRUCTION CORP → MICK SCREEN- EXTEC**

- 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

- **controller_controls_mine:** Samuel O  Mick → MICK SCREEN- EXTEC; 1998-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MICK CONSTRUCTION CORP → MICK SCREEN- EXTEC; 2002-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Samuel O  Mick → MICK CONSTRUCTION CORP; 2002-05-23 to current/open; source msha-controller-operator-history