# Relationship history for MSHA mine 5001834

Current hierarchy: **Colas S A → Glacier Construction Inc dba SERB → North Operations-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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Gordon  Crawley → North Operations-Wash Plant #1; 1995-03-01 to 2000-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → North Operations-Wash Plant #1; 2000-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** University Redi-Mix Conctrete Products → North Operations-Wash Plant #1; 2006-03-31 to 2018-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → University Redi-Mix Conctrete Products; 2006-03-31 to 2018-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Gordon  Crawley → University Redi-Mix Conctrete Products; 2006-03-31 to 2000-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → North Operations-Wash Plant #1; 2018-03-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Glacier Construction Inc dba SERB → North Operations-Wash Plant #1; 2018-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Glacier Construction Inc dba SERB; 2018-05-01 to current/open; source msha-controller-operator-history