# Relationship history for MSHA mine 2302510

Current hierarchy: **Emery Sapp Construction Inc → Hutchens Construction Co LLC → Portable Plant #2 Rockster**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Phil  Hutchens → Portable Plant #2 Rockster; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hutchens Construction Co → Portable Plant #2 Rockster; 2016-10-13 to 2019-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Phil  Hutchens → Hutchens Construction Co; 2016-10-13 to 2019-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Hutchens Construction Co LLC → Portable Plant #2 Rockster; 2019-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emery Sapp & Sons Inc → Portable Plant #2 Rockster; 2019-05-02 to 2023-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Emery Sapp & Sons Inc → Hutchens Construction Co LLC; 2019-05-02 to 2023-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Emery Sapp Construction Inc → Portable Plant #2 Rockster; 2023-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Emery Sapp Construction Inc → Hutchens Construction Co LLC; 2023-04-07 to current/open; source msha-controller-operator-history