# Relationship history for MSHA mine 4202205

Current hierarchy: **Ronnie D Hunt → Highline Sand & Gravel → Portable #1**

- 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:** Taylor Landscaping → Portable #1; 1998-06-01 to 2009-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Kerry  Taylor → Portable #1; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerry  Taylor → Taylor Landscaping; 1998-06-01 to 2009-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Highline Sand & Gravel → Portable #1; 2009-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ron L  Moosman et al → Portable #1; 2009-08-19 to 2014-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Ron L  Moosman et al → Highline Sand & Gravel; 2009-08-19 to 2014-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Ronnie D Hunt → Portable #1; 2014-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie D Hunt → Highline Sand & Gravel; 2014-10-01 to current/open; source msha-controller-operator-history