# Relationship history for MSHA mine 4703624

Current hierarchy: **Ezra Y  Yacob → EOG Resources, Inc. → Chippewa Falls Sand Plant**

- 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

- **controller_controls_mine:** Mark G  Papa et al → Chippewa Falls Sand Plant; 2007-12-04 to 2014-01-27; source msha-controller-operator-history
- **operator_operates_mine:** EOG Resources, Inc. → Chippewa Falls Sand Plant; 2011-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark G  Papa et al → EOG Resources, Inc.; 2011-09-23 to 2014-01-27; source msha-controller-operator-history
- **controller_controls_mine:** William R  Thomas et al → Chippewa Falls Sand Plant; 2014-01-28 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** William R  Thomas et al → EOG Resources, Inc.; 2014-01-28 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Ezra Y  Yacob et al → Chippewa Falls Sand Plant; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ezra Y  Yacob et al → EOG Resources, Inc.; 2021-10-01 to current/open; source msha-controller-operator-history