# Relationship history for MSHA mine 2104089

Current hierarchy: **John Martin Thompson → Ray thompson and Company Excavating Inc → Thompson Screen**

- 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

- **controller_controls_mine:** John Martin Thompson → Thompson Screen; 2024-09-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ray thompson and Company Excavating Inc → Thompson Screen; 2024-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Martin Thompson → Ray thompson and Company Excavating Inc; 2024-09-25 to current/open; source msha-controller-operator-history