# Relationship history for MSHA mine 1401651

Current hierarchy: **Michael W  Higgins → Higgins Ranch → Higgins Ranch, LLC & Shults Quarry**

- 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

- **operator_operates_mine:** Higgins Ranch → Higgins Ranch, LLC & Shults Quarry; 2005-10-18 to 2011-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Michael W  Higgins → Higgins Ranch, LLC & Shults Quarry; 2005-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael W  Higgins → Higgins Ranch; 2005-10-18 to 2011-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Higgins Ranch → Higgins Ranch, LLC & Shults Quarry; 2011-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael W  Higgins → Higgins Ranch, LLC & Shults Quarry; 2011-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael W  Higgins → Higgins Ranch; 2011-03-11 to current/open; source msha-controller-operator-history