# Relationship history for MSHA mine 2103514

Current hierarchy: **Tom  Egge → 71 Aggregate, Inc → Wash Plant ML-42 ML-6**

- 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:** Chad Monson Excavating LLC → Wash Plant ML-42 ML-6; 2005-09-12 to 2008-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Chad  Monson → Wash Plant ML-42 ML-6; 2005-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad  Monson → Chad Monson Excavating LLC; 2005-09-12 to 2008-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Monson Corporation → Wash Plant ML-42 ML-6; 2008-07-01 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Chad  Monson → Wash Plant ML-42 ML-6; 2008-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad  Monson → Monson Corporation; 2008-07-01 to 2013-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Gary Monson Excavating, LLC → Wash Plant ML-42 ML-6; 2014-01-01 to 2016-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Gary L Monson → Wash Plant ML-42 ML-6; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L Monson → Gary Monson Excavating, LLC; 2014-01-01 to 2016-08-21; source msha-controller-operator-history
- **operator_operates_mine:** 71 Aggregate, Inc → Wash Plant ML-42 ML-6; 2016-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Egge → Wash Plant ML-42 ML-6; 2016-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Egge → 71 Aggregate, Inc; 2016-08-22 to current/open; source msha-controller-operator-history