# Relationship history for MSHA mine 0504859

Current hierarchy: **Richard F  Wyatt; Rodney B  Wyatt → Wyatt Redi-Mix Co → Portable Crusher #1**

- 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:** Rodney B  Wyatt et al → Portable Crusher #1; 1983-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wyatt Redi-Mix Co → Portable Crusher #1; 2006-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney B  Wyatt et al → Wyatt Redi-Mix Co; 2006-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard F  Wyatt et al → Wyatt Redi-Mix Co; 2006-11-01 to current/open; source msha-controller-operator-history