# Relationship history for MSHA mine 2402728

Current hierarchy: **Elisabeth  Andrews; Mark  Andrews; Pamela  Covey → Mobile Rock Crushing → Mobile**

- 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:** Mobile Rock Crushing → Mobile; 2018-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pamela  Covey → Mobile; 2018-05-15 to 2023-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Pamela  Covey → Mobile Rock Crushing; 2018-05-15 to 2023-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Elisabeth  Andrews → Mobile; 2023-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elisabeth  Andrews → Mobile Rock Crushing; 2023-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pamela  Covey → Mobile Rock Crushing; 2023-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Andrews → Mobile Rock Crushing; 2023-11-13 to current/open; source msha-controller-operator-history