# Relationship history for MSHA mine 2003128

Current hierarchy: **Ronald W Popp → R W Popp Excavating Inc → DIAMOND**

- 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:** R W Popp Excavating Inc → DIAMOND; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald W Popp → DIAMOND; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W Popp → R W Popp Excavating Inc; 1999-07-01 to current/open; source msha-controller-operator-history