# Relationship history for MSHA mine 0405929

Current hierarchy: **Roko  Grbic; Mile  Grbic → MRC Rock & Sand LLC → Cucamonga Creek Mine**

- 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:** MRC Rock & Sand LLC → Cucamonga Creek Mine; 2018-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roko  Grbic et al → Cucamonga Creek Mine; 2018-09-19 to 2020-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Roko  Grbic et al → MRC Rock & Sand LLC; 2018-09-19 to 2020-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Teague et al → MRC Rock & Sand LLC; 2018-09-19 to 2020-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Mile  Grbic et al → MRC Rock & Sand LLC; 2018-09-19 to 2020-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Roko  Grbic et al → Cucamonga Creek Mine; 2020-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roko  Grbic et al → MRC Rock & Sand LLC; 2020-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mile  Grbic et al → MRC Rock & Sand LLC; 2020-11-01 to current/open; source msha-controller-operator-history