# Relationship history for MSHA mine 4503773

Current hierarchy: **Kim A  Hamilton; Reggie L  Hamilton → Hamilton Rocking & Contracting Inc. → Portable Jaw Crusher**

- 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:** Hamilton Rocking & Contracting Inc. → Portable Jaw Crusher; 2017-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kim A  Hamilton et al → Portable Jaw Crusher; 2017-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kim A  Hamilton et al → Hamilton Rocking & Contracting Inc.; 2017-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reggie L  Hamilton et al → Hamilton Rocking & Contracting Inc.; 2017-08-02 to current/open; source msha-controller-operator-history