# Relationship history for MSHA mine 4801796

Current hierarchy: **Rick  Caylor; James  Genz → Caylor & Genz Earthmovers, Inc → Portable Crusher 1 & 2**

- 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:** Caylor & Genz Earthmovers, Inc → Portable Crusher 1 & 2; 2016-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Genz et al → Portable Crusher 1 & 2; 2016-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Genz et al → Caylor & Genz Earthmovers, Inc; 2016-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Caylor et al → Caylor & Genz Earthmovers, Inc; 2016-02-24 to current/open; source msha-controller-operator-history