# Relationship history for MSHA mine 3901492

Current hierarchy: **Thomas Wayne  Mahlke; Thomas John  Mahkle → Eureka Ready Mix → Wash Plant 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

- **operator_operates_mine:** Eureka Ready Mix → Wash Plant 1; 2004-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas John  Mahkle et al → Wash Plant 1; 2004-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas John  Mahkle et al → Eureka Ready Mix; 2004-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Wayne  Mahlke et al → Eureka Ready Mix; 2004-04-08 to current/open; source msha-controller-operator-history