# Relationship history for MSHA mine 0405888

Current hierarchy: **Kirk Arnold  Schulthess → Cutting Edge Aggregates Inc → Plant 4**

- 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:** Kirk Arnold  Schulthess → Plant 4; 2008-09-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cutting Edge Aggregates Inc → Plant 4; 2014-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk Arnold  Schulthess → Cutting Edge Aggregates Inc; 2014-07-03 to current/open; source msha-controller-operator-history