# Relationship history for MSHA mine 2103465

Current hierarchy: **Cullen E  DeRuyter → CRC Sand & Gravel LLC → Kolman Screening Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Robert Rupp Construction → Kolman Screening Plant; 2004-08-11 to 2020-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Rupp → Kolman Screening Plant; 2004-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Rupp → Robert Rupp Construction; 2004-08-11 to 2020-04-30; source msha-controller-operator-history
- **operator_operates_mine:** CRC Sand & Gravel LLC → Kolman Screening Plant; 2020-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cullen E  DeRuyter → Kolman Screening Plant; 2020-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cullen E  DeRuyter → CRC Sand & Gravel LLC; 2020-05-01 to current/open; source msha-controller-operator-history