# Relationship history for MSHA mine 0404829

Current hierarchy: **Evans Ray & Don Harris → Evans/Harris Mining → Desert Air**

- 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:** Evans/Harris Mining → Desert Air; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Evans Ray & Don Harris → Desert Air; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evans Ray & Don Harris → Evans/Harris Mining; 1986-08-01 to current/open; source msha-controller-operator-history