# Relationship history for MSHA mine 3304435

Current hierarchy: **Angela  Varvaras; Yianni  Karvounides → Core Aggregates, LLC → Core 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:** Gans Ltd Brimfield Sand & Soil → Core Aggregates,LLC; 1998-04-01 to 2018-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Erb  et al → Core Aggregates,LLC; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Erb  et al → Gans Ltd Brimfield Sand & Soil; 1998-04-01 to 2018-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Ellis  Erb  et al → Gans Ltd Brimfield Sand & Soil; 1998-04-01 to 2018-02-20; source msha-controller-operator-history
- **operator_operates_mine:** Core Aggregates, LLC → Core Aggregates,LLC; 2018-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Yianni  Karvounides et al → Core Aggregates,LLC; 2018-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Yianni  Karvounides et al → Core Aggregates, LLC; 2018-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Angela  Varvaras et al → Core Aggregates, LLC; 2018-02-21 to current/open; source msha-controller-operator-history