# Relationship history for MSHA mine 3609448

Current hierarchy: **Karl  Gesford → Karl Gesford → Gesford Quarry #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Karl Gesford → Gesford Quarry #1; 2006-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Karl  Gesford → Gesford Quarry #1; 2006-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karl  Gesford → Karl Gesford; 2006-02-01 to current/open; source msha-controller-operator-history