# Relationship history for MSHA mine 3503745

Current hierarchy: **Ronald Lee  Staley → Ron Staley Road Construction, Inc. → Portable Jaw**

- 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:** Ron Staley Road Construction, Inc. → Portable Jaw; 2010-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald Lee  Staley → Portable Jaw; 2010-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald Lee  Staley → Ron Staley Road Construction, Inc.; 2010-04-15 to current/open; source msha-controller-operator-history