# Relationship history for MSHA mine 0504131

Current hierarchy: **CRH PLC → Durango Construction → 150-3 TRIMBLE/TAULLI**

- 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:** Siegrist Construction Company Et Al → 150-3 TRIMBLE/TAULLI; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Burnett Construction Company → 150-3 TRIMBLE/TAULLI; 1985-06-01 to 1997-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Siegrist Construction Company Et Al → Burnett Construction Company; 1985-06-01 to 1997-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Durango Construction → 150-3 TRIMBLE/TAULLI; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → 150-3 TRIMBLE/TAULLI; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Durango Construction; 1997-09-01 to current/open; source msha-controller-operator-history