# Relationship history for MSHA mine 4703258

Current hierarchy: **Mark  Teunissen → Kiel Sand & Gravel Inc → Robotrac SA4787**

- 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:** Mark  Teunissen → Robotrac SA4787; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kiel Sand & Gravel Inc → Robotrac SA4787; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Teunissen → Kiel Sand & Gravel Inc; 2001-01-01 to current/open; source msha-controller-operator-history