# Relationship history for MSHA mine 2602637

Current hierarchy: **Michael W  Lattin → Canyon Construction Co → Simplicity Double Deck 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:** Michael W  Lattin → Simplicity Double Deck Screen; 1997-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Canyon Construction Co → Simplicity Double Deck Screen; 2008-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael W  Lattin → Canyon Construction Co; 2008-03-13 to current/open; source msha-controller-operator-history