# Relationship history for MSHA mine 1700730

Current hierarchy: **DAVID I  OBERT → DMO LANDSCAPING INC → DAVID I OBERT**

- 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:** DMO LANDSCAPING INC → DAVID I OBERT; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** DAVID I  OBERT → DAVID I OBERT; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DAVID I  OBERT → DMO LANDSCAPING INC; 2002-05-29 to current/open; source msha-controller-operator-history