# Relationship history for MSHA mine 4503697

Current hierarchy: **Daniel Cole  Eilers → Baseline Crushing Inc. → Portable 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Baseline Trucking, Inc. → Portable Plant; 2011-09-27 to 2017-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Hurd → Portable Plant; 2011-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Hurd → Baseline Trucking, Inc.; 2011-09-27 to 2017-07-02; source msha-controller-operator-history
- **operator_operates_mine:** Baseline Crushing Inc. → Portable Plant; 2017-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel Cole  Eilers → Portable Plant; 2017-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Cole  Eilers → Baseline Crushing Inc.; 2017-07-03 to current/open; source msha-controller-operator-history