# Relationship history for MSHA mine 4503562

Current hierarchy: **David G  Randles → Randle's Sand & Gravel Inc. → Looker Prop. So. Canyon Pit Portable**

- 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:** David G  Randles → Looker Prop. So. Canyon Pit Portable; 1985-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Randle's Sand & Gravel Inc. → Looker Prop. So. Canyon Pit Portable; 2004-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David G  Randles → Randle's Sand & Gravel Inc.; 2004-02-27 to current/open; source msha-controller-operator-history