# Relationship history for MSHA mine 2501311

Current hierarchy: **Tiffany  Rietzke; Ryan  Rietzke → CenCon of Kansas LLC → Portable #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:** CenCon of Kansas LLC → Portable #1; 2020-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ryan  Rietzke et al → Portable #1; 2020-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Rietzke et al → CenCon of Kansas LLC; 2020-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tiffany  Rietzke et al → CenCon of Kansas LLC; 2020-05-11 to current/open; source msha-controller-operator-history