# Relationship history for MSHA mine 2103579

Current hierarchy: **Chad  Monson → Monson Corporation → Portable Crusher/Screen Monson 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Chad  Monson → Portable Crusher/Screen Monson Pit; 2005-09-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chad Monson Excavating LLC → Portable Crusher/Screen Monson Pit; 2007-05-08 to 2008-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Chad  Monson → Chad Monson Excavating LLC; 2007-05-08 to 2008-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Monson Corporation → Portable Crusher/Screen Monson Pit; 2008-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chad  Monson → Portable Crusher/Screen Monson Pit; 2008-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad  Monson → Monson Corporation; 2008-07-01 to current/open; source msha-controller-operator-history