# Relationship history for MSHA mine 3609150

Current hierarchy: **Joseph P  Cromyak; Dorothy A  Cromyak → Jett Contracting Co. → Jett #2 Stripping**

- 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:** Joseph P  Cromyak → Jett #2 Stripping; 1985-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jett Contracting Co. → Jett #2 Stripping; 2003-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph P  Cromyak → Jett Contracting Co.; 2003-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dorothy A  Cromyak → Jett Contracting Co.; 2003-05-27 to current/open; source msha-controller-operator-history