# Relationship history for MSHA mine 4606034

Current hierarchy: **Vernon P  Ferrell → Ferrell Excavating Co., Inc. → Ferrell Quarry and 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

- **operator_operates_mine:** Ferrell Excavating Co., Inc. → Ferrell Quarry and Plant; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ferrell Excavating Company Inc → Ferrell Quarry and Plant; 1979-01-01 to 1999-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Ferrell Excavating Company Inc → Ferrell Excavating Co., Inc.; 1979-01-01 to 1999-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Vernon P  Ferrell → Ferrell Quarry and Plant; 1999-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vernon P  Ferrell → Ferrell Excavating Co., Inc.; 1999-02-02 to current/open; source msha-controller-operator-history