# Relationship history for MSHA mine 2302352

Current hierarchy: **Emery Sapp Construction Inc → Emery Sapp & Sons, Inc. → Shell Knob Quarry**

- 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:** Phil  Hutchens → Shell Knob Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hutchens Construction Co. → Shell Knob Quarry; 2006-12-05 to 2019-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Phil  Hutchens → Hutchens Construction Co.; 2006-12-05 to 2019-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Emery Sapp & Sons, Inc. → Shell Knob Quarry; 2019-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emery Sapp & Sons Inc → Shell Knob Quarry; 2019-05-02 to 2023-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Emery Sapp & Sons Inc → Emery Sapp & Sons, Inc.; 2019-05-02 to 2023-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Emery Sapp Construction Inc → Shell Knob Quarry; 2023-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Emery Sapp Construction Inc → Emery Sapp & Sons, Inc.; 2023-04-07 to current/open; source msha-controller-operator-history