# Relationship history for MSHA mine 0504785

Current hierarchy: **George  Zadel → Northern Colorado Constructors, Inc. → Bennett Pit**

- 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 Colorado Constructors, Inc. → Bennett Pit; 2004-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George  Zadel Et Al → Bennett Pit; 2004-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Zadel Et Al → Northern Colorado Constructors, Inc.; 2004-04-20 to current/open; source msha-controller-operator-history