# Relationship history for MSHA mine 0505083

Current hierarchy: **Wayne R Erickson; Randall  Kurtz → West Ranch Aggregates LLC → West Ranch Aggregates LLC**

- 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:** West Ranch Aggregates LLC → West Ranch Aggregates LLC; 2017-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wayne R Erickson et al → West Ranch Aggregates LLC; 2017-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne R Erickson et al → West Ranch Aggregates LLC; 2017-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall  Kurtz et al → West Ranch Aggregates LLC; 2017-09-21 to current/open; source msha-controller-operator-history